Cookies.js v0.4.0

• Replaced deprecated toGMTString with toUTCString (Thanks @Zorbash!)
• Added a proper bower.json file (Thanks @jstayton!)
• Fixed bug where Cookies.enabled was always returning true in IE7 and IE8 (Thanks @brianlow!)
• Updated cookies.d.ts for Typescript 1.0 (Thanks @flashandy!)
• Fixed unnecessarily encoding characters in cookie keys that are allowed by RFC6265, and
  fixed not encoding a couple characters in cookies keys that are not allowed by RFC6265.
  (Issue #18)
• Moved the change log to its own file.