Updated phpunit version to deal with bug
Updated phpunit version to deal with bug

When I added new tests some old ones stopped running, and this upgrade
resolves that.

jaredtking/Stash,theUniC/Stash,alawnchen/Stash,csburton/Stash,tedious/Stash,bankiru/Stash,andrerom/Stash,theUniC/Stash,localheinz/Stash,tedious/Stash,graphis/Stash,alawnchen/Stash,jaredtking/Stash,AndrewCarterUK/Stash,localheinz/Stash,graphis/Stash,andrerom/Stash,csburton/Stash,AndrewCarterUK/Stash,bankiru/Stash