Trying to get that Coveralls % higher...

Adds spec to check InjectClient. 

* Checks that the env["ocean"] variable is created and it's a DigitalOcean::API
* Checks that the env["ocean"] variable created uses the config values from ~/.tugboat.
Merge pull request #113 from pearkes/add_inject_client_spec

Trying to get that Coveralls % higher...