Dont limit group posts to only title and summary

The group post can also have a content field
Merge pull request #185 from ismell/allow-content-on-group-post

Dont limit group posts to only title and summary
Added an example for the communication API using the messages.
Moved the message test spec under the right context.
Merge pull request #189 from schallereqo/master

Communication api for using messages was not clear, this will make it clearer
Making the authenticate.rb example a little clearer
Cleanup of LICENSE, README and gemspec