Add librato addon
Installation from source instructions [ci skip]
Merge pull request #440 from Helabs/mj-installation-from-source-instructions

Installation from source instructions [ci skip]
Add HerokuApp#add_librato_source.
Merge branch 'master' into tb/add-librato-addon

Conflicts:
	CHANGELOG.md
	lib/pah/files/Gemfile
Move librato-rails gem outside of production environment.
Add policy about feature request
Merge pull request #428 from Helabs/tb/add-librato-addon

Add librato addon
Move from sendgrid to mandrill