[base::repositories] changes naming of hashes

'if apt_keys.include? key' sounds too ambiguous. This change should use
better naming.
[apache] removes CHANGELOG
Adds Strainerfile
Accesses node attributes in a consistent manner
Accesses mysql node attributes in a consistently
Changes execute notify to newer syntax
Deletes nginx_proxy lwrp
Uses chef file_cache_path instead of /tmp
Updates travis.yml
Updates foodcritic command with bundle exec
Merge pull request #29 from openminds/refactor/foodcritic

Refactor/foodcritic