Fixes#362
- There is no need to set the viewport on functional tests anymore
unless something other
than the default of 1280x1024 is desired.
- There is no need to invoke `casper.run` to trigger `test.done`
anymore for functional tests.
- Each test works independently of the rest; registration is handled
once for the lifetime of the test run and then login/logout can be
invoked automatically as desired.
- Mocha tests all utilize predefined, more realistic fixtures when
appropriate.
- Renamed old api tests that were really model tests as appropraite.
- Added example api test for posts.
