Add unit tests + fixes.

Add unit tests + fixes.
Create JLinkedinGroups class.

Create JLinkedinGroups class.
Add getGroup() method to JLinkedinGroups.

Add getGroup() method to JLinkedinGroups.
Add getMemberships() method to JLinkedinGroups.

Add getMemberships() method to JLinkedinGroups.
Add getSettings() method to JLinkedinGroups.

Add getSettings() method to JLinkedinGroups.
Add changeSettings() method to JLinkedinGroups. Add PUT method to JOAuth1aClient. Add boolean_to_string() method to JLinkedinObject.

Add changeSettings() method to JLinkedinGroups. Add PUT method to JOAuth1aClient. Add boolean_to_string() method to JLinkedinObject.
Add joinGroup() and leaveGroup() methods to JLinkedinGroups. Add DELETE to JOAuth1aClient.

Add joinGroup() and leaveGroup() methods to JLinkedinGroups. Add DELETE to JOAuth1aClient.
Add getDiscussions() method to JLinkedinGroups.

Add getDiscussions() method to JLinkedinGroups.
Add getUserPosts() method to JLinkedinGroups.

Add getUserPosts() method to JLinkedinGroups.
Add getPost() method to JLinkedinGroups.

Add getPost() method to JLinkedinGroups.
Add getPostComments() method to JLinkedinGroups.

Add getPostComments() method to JLinkedinGroups.
Add createPost() method to JLinkedinGroups.

Add createPost() method to JLinkedinGroups.
Refine the JOauth1aClient and JOauthLinkedin classes.
Make necessary changes so that everything works with the new JOauth1aClient.

Make necessary changes so that everything works with the new JOauth1aClient.
Add followPost() and unfollowPost() methods to JLinkedinGroups.

Add followPost() and unfollowPost() methods to JLinkedinGroups.
Add flagPost() method to JLinkedinGroups.

Add flagPost() method to JLinkedinGroups.
Add deletePost() method to JLinkedinGroups.

Add deletePost() method to JLinkedinGroups.
Add getComment() method to JLinkedinGroups.

Add getComment() method to JLinkedinGroups.
Add addComment() method to JLinkedinGroups.

Add addComment() method to JLinkedinGroups.
Add deleteComment() method to JLinkedinGroups.

Add deleteComment() method to JLinkedinGroups.