- Implemented subscription feature
	- courses on course page can be subscribed to a User
- added some tests for Message model
- messages are now added to current course selected instead of hard coded value

Note: currently there is bug in course subscription:
	- you must go to users page and click on user1(with id=1) to load user contents to store
	- after that you may successfully subscribe to courses

Note: also removed side loading data for courses
	- this was essential to make subscription work
Merge https://github.com/jasonpharder/notes-n-things
- integrated message board with login user
- integrated subscription with login system
- cleaning up of code