Fix bug where users could have overloaded strlen() with
http://php.net/manual/en/mbstring.overload.php. If mb_strlen exists we
will use that, else fall back on strlen()
Merge pull request #93 from Trii/dev

Fix for overloaded strlen
wip
Merge branch 'dev' of https://github.com/nategood/httpful into dev
Cleaning up and adding tests for Pull Request

Unit tests added
Slight code refactor to make smaller atomic unit