Merge pull request #1 from newrelic-forks/apiHost

Allow users to set the api host (some of us need this)
Merge pull request #2 from newrelic-forks/apiHost

Update documentation with new configuration variable
Merge pull request #3 from newrelic-forks/single_item

Add support for much more of the API
Merge remote-tracking branch 'upstream/master' into spkane/docs_0.2.1

* upstream/master: