Improved Version Constraints

* Firstly, seeing `dev-master` for `nikic/php-parser` makes me sad. I've changed it to `1.0.*@dev`.
* Secondly, seeing `*` for `phploc/phploc` makes me sad too. I've changed it to `2.*`.
* Finally, I've tweaked the version constraint of `phake/phake` to make it an actual version constraint. My version constraint say get any 2.0.x version provided it has a stability of beta or higher.

This project looks pretty cool @ircmaxell. I'm looking forward to the future. :)