Adding Passenger 4 support including some of https://github.com/debona
changes. Also providing updated rspec tests. Tested with travis.
Merge pull request #41 from berndmweber/master

Adding Passenger 4 support including some of [debona's](https://github.com/debona)
Initial attempt at refactoring Passenger.

* Break functionality out into install, config, and compile classes.
* Add a passenger_dependencies option for listing out compile
  dependencies.
* Fix specs.
Fixes to ensure we drag in concat and set params needed for apache.