Update gems

Update jumpup to 0.0.8

Update .ruby-version to 2.1.5

Ajust gems versions
Merge pull request #435 from Helabs/tbo-update-gems

Update Ruby, Rails and other gems
Handle version and help commands, instead of delegate directly to rails new
Installation from source instructions [ci skip]
Merge pull request #439 from Helabs/mj-commands

Handle version and help commands, instead of delegate directly to rails ...
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