php version is already prefixed, no need to do it again - fixes #208
Add proxy support
Merge pull request #210 from xophm1/develop

Add proxy support
added .phpbrewrc support #223

TODO:
 - maybe we need a way to restore php version after leaving dir with .phpbrewrc
 - maybe create general hooks to be used inside .phpbrewrc files (ondir, onleave)