updating the rbenv role, removing environment
adding rbenv_environment for installing rbenv
setting HOME to rbenv_dir for bundle install to work
Merge branch 'jarv/common-refactor' into jarv/rbenv-update
setting the rbenv home to the application directory rather than the
rbenv dir
updating the ruby_env env file
create_home->createhome
updating the defaults in edxapp to use the single rbenv
removing git and libmysqlclient-dev
using for loop for environment file
logrotate is not a service

Conflicts:
	playbooks/roles/common/handlers/main.yml
Merge pull request #355 from edx/jarv/rbenv-update

updating the rbenv role, removing environment