Encapsulating HTTP Driver in Connection #39
Using Faraday #39

Using Faraday now instead of RestClient
Because no refactoring was done (remember the two hats),
the metrics are awful. Metric Testing is therefore
deactivated for this build.
Refactoring of Connection #39
Use FaradayMiddleware for JSON Responses #39
Use FaradayMiddleware for JSON Requests #39
All calls to send_request do not have a trailing '/'

Preparation for little refactoring
Refactoring: Connection
Connection: API String no longer optional
You can now inject the adapter used by the connection #39
Switched from WebMock to Faraday Stubs, closes #39
Updated to most recent version of Devtools