Create Group via Application resource without needing a Directory href
Merge branch 'dev' into createAppGroup and resolved conflicts.  This merge picks up 'create app account' functionality as well.

Modified minor implementation details, added JavaDoc, and added integration tests.
Merge branch 'dev' into createAppGroup and resolved conflicts.  This merge picks up 'create app account' functionality as well.

Modified minor implementation details, added JavaDoc, and added integration tests.
Removed all vestiges of CreateGroupRequest and Builder until we actually need it.  It can be added again quickly/easily.
Merge pull request #20 from stormpath/create_group_via_application_resource

Create Group via Application resource directly (without needing to know the Directory href)