Add New Relic PHP Agent & Plugin Agent using evertrue/newrelic

This takes full advantage of refactoring to a fork of the newrelic
cookbook to install the Plugin Agent in addition to the PHP Agent.

This reverts commit 0ad5d7c6be82add370d27600d72cce6e56be6a5e.
Use Hosted Chef server for our cookbooks

Better versioning than using GitHub
Bump to 0.7.0
Merge branch 'refs/heads/jeff/add-newrelic'

* refs/heads/jeff/add-newrelic:
  Bump to 0.7.0
  Use Hosted Chef server for our cookbooks
  Add New Relic PHP Agent & Plugin Agent using evertrue/newrelic