* Groundwork for the fix.
Added CookieUtils.kt which will hold all the code for parsing rfc6265 dates.
Added fromCookieToGmtDate in DateUtils. Falls back on fromHttpToGmtDate.
Changed Cookie to use this new function.

* Added a bunch of tests to guide development.

* Added test for single digit day-of-month, hours, minutes, seconds & double-digit year.

* Added some documentation to StringLexer.

* Added the parsing of date-tokens as well as result conformation testing. Also added a few extension functions on Char

* Fixed some test cases.

* Implemented the parsing of rfc6265 section 5.1.1 date parsing algorithm

* Added consumption of octets after parsing 'time' for brevity