Merge pull request #53 from Nyholm/patch-1

Added PHP 5.6, 5.5 and HHVM to travis.yml
Merge pull request #54 from henrikbjorn/cleanup

Pimple3
Remove Compiler class which is not used in 2.0 anymore
Merge pull request #59 from henrikbjorn/cleanup2

Remove Compiler class which is not used in 2.0 anymore
Update README.md

The doc speaks about compiling Cilex to a .phar but this looks outdated as there are no `compile` php file anymore.
Merge pull request #61 from ninsuo/patch-1

Update README.md
Use a guard instead of having the whole thing indented in boot