(function (window) {
  if (!window.document) return;
  var document = window.document;

  //https://github.com/inexorabletash/polyfill/blob/master/web.js
    if (!document.querySelectorAll) {
      document.querySelectorAll = function (selectors) {
        var style = document.createElement('style'), elements = [], element;
        document.documentElement.firstChild.appendChild(style);
        document._qsa = [];

        style.styleSheet.cssText = selectors + '{x-qsa:expression(document._qsa && document._qsa.push(this))}';
        window.scrollBy(0, 0);
        style.parentNode.removeChild(style);

        while (document._qsa.length) {
          element = document._qsa.shift();
          element.style.removeAttribute('x-qsa');
          elements.push(element);
        }
        document._qsa = null;
        return elements;
      };
    }

    if (!document.querySelector) {
      document.querySelector = function (selectors) {
        var elements = document.querySelectorAll(selectors);
        return (elements.length) ? elements[0] : null;
      };
    }

    if (!document.getElementsByClassName) {
      document.getElementsByClassName = function (classNames) {
        classNames = String(classNames).replace(/^|\s+/g, '.');
        return document.querySelectorAll(classNames);
      };
    }

  //https://github.com/inexorabletash/polyfill
  // ES5 15.2.3.14 Object.keys ( O )
  // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/keys
  if (!Object.keys) {
    Object.keys = function (o) {
      if (o !== Object(o)) { throw TypeError('Object.keys called on non-object'); }
      var ret = [], p;
      for (p in o) {
        if (Object.prototype.hasOwnProperty.call(o, p)) {
          ret.push(p);
        }
      }
      return ret;
    };
  }

  //https://github.com/inexorabletash/polyfill/blob/master/web.js
  (function (global) {
    var B64_ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
    global.atob = global.atob || function (input) {
      input = String(input);
      var position = 0,
          output = [],
          buffer = 0, bits = 0, n;

      input = input.replace(/\s/g, '');
      if ((input.length % 4) === 0) { input = input.replace(/=+$/, ''); }
      if ((input.length % 4) === 1) { throw Error('InvalidCharacterError'); }
      if (/[^+/0-9A-Za-z]/.test(input)) { throw Error('InvalidCharacterError'); }

      while (position < input.length) {
        n = B64_ALPHABET.indexOf(input.charAt(position));
        buffer = (buffer << 6) | n;
        bits += 6;

        if (bits === 24) {
          output.push(String.fromCharCode((buffer >> 16) & 0xFF));
          output.push(String.fromCharCode((buffer >>  8) & 0xFF));
          output.push(String.fromCharCode(buffer & 0xFF));
          bits = 0;
          buffer = 0;
        }
        position += 1;
      }

      if (bits === 12) {
        buffer = buffer >> 4;
        output.push(String.fromCharCode(buffer & 0xFF));
      } else if (bits === 18) {
        buffer = buffer >> 2;
        output.push(String.fromCharCode((buffer >> 8) & 0xFF));
        output.push(String.fromCharCode(buffer & 0xFF));
      }

      return output.join('');
    };

    global.btoa = global.btoa || function (input) {
      input = String(input);
      var position = 0,
          out = [],
          o1, o2, o3,
          e1, e2, e3, e4;

      if (/[^\x00-\xFF]/.test(input)) { throw Error('InvalidCharacterError'); }

      while (position < input.length) {
        o1 = input.charCodeAt(position++);
        o2 = input.charCodeAt(position++);
        o3 = input.charCodeAt(position++);

        // 111111 112222 222233 333333
        e1 = o1 >> 2;
        e2 = ((o1 & 0x3) << 4) | (o2 >> 4);
        e3 = ((o2 & 0xf) << 2) | (o3 >> 6);
        e4 = o3 & 0x3f;

        if (position === input.length + 2) {
          e3 = 64; e4 = 64;
        }
        else if (position === input.length + 1) {
          e4 = 64;
        }

        out.push(B64_ALPHABET.charAt(e1),
                 B64_ALPHABET.charAt(e2),
                 B64_ALPHABET.charAt(e3),
                 B64_ALPHABET.charAt(e4));
      }

      return out.join('');
    };
  }(window));

  //https://gist.github.com/jimeh/332357
  if (!Object.prototype.hasOwnProperty){
      /*jshint -W001, -W103 */
      Object.prototype.hasOwnProperty = function(prop) {
      var proto = this.__proto__ || this.constructor.prototype;
      return (prop in this) && (!(prop in proto) || proto[prop] !== this[prop]);
    };
      /*jshint +W001, +W103 */
  }

  // @license http://opensource.org/licenses/MIT
  // copyright Paul Irish 2015


  // Date.now() is supported everywhere except IE8. For IE8 we use the Date.now polyfill
  //   github.com/Financial-Times/polyfill-service/blob/master/polyfills/Date.now/polyfill.js
  // as Safari 6 doesn't have support for NavigationTiming, we use a Date.now() timestamp for relative values

  // if you want values similar to what you'd get with real perf.now, place this towards the head of the page
  // but in reality, you're just getting the delta between now() calls, so it's not terribly important where it's placed


  (function(){

    if ('performance' in window === false) {
        window.performance = {};
    }
    
    Date.now = (Date.now || function () {  // thanks IE8
      return new Date().getTime();
    });

    if ('now' in window.performance === false){
      
      var nowOffset = Date.now();
      
      if (performance.timing && performance.timing.navigationStart){
        nowOffset = performance.timing.navigationStart;
      }

      window.performance.now = function now(){
        return Date.now() - nowOffset;
      };
    }

  })();

  //requestAnimationFrame polyfill for older Firefox/Chrome versions
  if (!window.requestAnimationFrame) {
    if (window.webkitRequestAnimationFrame) {
    //https://github.com/Financial-Times/polyfill-service/blob/master/polyfills/requestAnimationFrame/polyfill-webkit.js
    (function (global) {
      // window.requestAnimationFrame
      global.requestAnimationFrame = function (callback) {
        return webkitRequestAnimationFrame(function () {
          callback(global.performance.now());
        });
      };

      // window.cancelAnimationFrame
      global.cancelAnimationFrame = webkitCancelAnimationFrame;
    }(window));
    } else if (window.mozRequestAnimationFrame) {
      //https://github.com/Financial-Times/polyfill-service/blob/master/polyfills/requestAnimationFrame/polyfill-moz.js
    (function (global) {
      // window.requestAnimationFrame
      global.requestAnimationFrame = function (callback) {
        return mozRequestAnimationFrame(function () {
          callback(global.performance.now());
        });
      };

      // window.cancelAnimationFrame
      global.cancelAnimationFrame = mozCancelAnimationFrame;
    }(window));
    } else {
    (function (global) {
      global.requestAnimationFrame = function (callback) {
      return global.setTimeout(callback, 1000 / 60);
      };

      global.cancelAnimationFrame = global.clearTimeout;
    })(window);
    }
  }
})(this);
