Export PathMatcher

Hello @vinibaggio, 

This is to better facilitate Obvious/medium2#6180, so we can use Matador's path matching on the frontend and not have inconsistencies.

Should I update the `package.json` version with this change?

Please review the following commits I made in branch 'kylehardgrave-export-pathmatcher'.

76b7863a86c5fa732563706b53ed28ac8c473a9b (2013-06-25 16:57:28 -0700)
Export PathMatcher


R=@vinibaggio