Add newrelic_yml LWRP for easy newrelic.yml manipulation

Usefull to configure multiple Java app on the same host for exemple.
Remove too strict type checks
Replace the template by the newrelic_yml LWRP
Documents + exemple for newrelic_yml
Tweak(s)
Make recipes that actually depend on repository.rb 'standalone', fixes #68
Refactoring
Additional attribute for php's ext_conf_dir, fixes #56
Inspired by #67, an update to the original fix, fixes #56
Enabling configuration of the python-agent configuration file location, fixes #67
Add virtualenv support for the python agent, fixes #65
Missed EOY update(s)
Don't crash in case the PHP cookbook can't be found
Adding the possibility to not restart any service after php-agent install
Bugfix: php ext_conf_dir
Improve Ruby YAML hack search pattern
Update meetme-plugin.rb
version bump
RuboCop fixes
RuboCop fixes