Added unit tests for Logging::Formatter.
Running rake test now runs specs for vendor/seahorse simultaneously.
Squelched two pending unit tests.

The class under test may be removed shortly.
Removed the Aws::Api::ResultWrapper.

This class was previously used during API translation.  It
is no longer used/needed as this is handled instead by
the Query serializer plugin.
Added the ability to filter integration tests by tags.