Refactor: dumb down recipe, we only got ubuntu
Enhancement: refactor recipe to use providers
Enhancement: let apt cookbook handle updating of sources
Fix: CS
Enhancement: make error_log configurable
Fix: move all configuration to attributes

Also fixes error where "syslog" was created in current path
in case of an error.

Recipe also ensures that `/var/log/hhvm` is created.
Update: testing php-hhvm
Enhancement: allow installation of nightly or dbg via attributes
Update: README [ci skip]
Merge pull request #368 from till/refactor/php-hhvm

Refactor/php hhvm