Refactoring tests.

Rename client to interface in tests.
Beta-527: Raise client timeouts.
Beta-525: Change Timecop back to static date.

Adding comment how to test interface.
Merge remote-tracking branch 'upstream/master' into change_client_timeouts

Conflicts:
Change ssl version to TLSv1 as Marketo doesn't support SSLv3
Merge pull request #4 from den-sergeyev/change_client_timeouts

Change client timeouts