Fixing compatibility with PHP 5.5.x. Marking as a new minor-version, …

…since the change breaks BC.

Universal "params" mask bug-fix and performance improvements

Quick routing bug-fix and optimizations

Klein Version 2! New PSR-2 styling, and much, MUCH more:

klein#92

Lots of bug fixes and many more PHPUnit tests

Composer support, packagist listing, README link to the wiki

Easy way of getting a request's "body"

More compatible callback calling and more tests

Code cleanup

Route matching refactored, easy HTTP 405 handling, error route except…

…ion handling