Add helper method for configuring the http client.

* Respect the ENV['HTTP_PROXY'] setting
* Support https when connection via https (https://rock.lgscout.com)
* Support non proxyied plain old http connections
* Added some test, so I could test in my dev env.
bump minor
Pushed set up of http instance into the private method
Merge pull request #3 from Lookingglass/todd-proxy

ENV['HTTP_PROXY']