Changed the README file

The readme now reflects the awesomeness of this project. In reference to
issue #7.
Updated the README with more info

Now added a more clear description.
Merge pull request #11 from nedap/issue-10

Changed the README file
change to new style of validations
Rename model (message -> activity)
Delete Test Folder
add person id to messages
Add References to Messages
Rename Model (Messages -> Activities)
Merge pull request #12 from nedap/issue-2

Create Models and Add Validations
Merge branch 'master' into issue-3

Conflicts:
	db/migrate/20140305084342_add_person_id_to_messages.rb
	db/schema.rb