add 'ClassNotes' as a submenu of MyCourse
add contorllers and views for ClassNotes
add controller and view for the ClassNotes
remove current menu to get the latest
get the latest version

Merge remote-tracking branch 'upstream/master'

Conflicts:
	models/menu.py
define table for notes
add filed title for talbe note_version
Update db_notes.py
Update db_notes.py
Update db_notes.py
Update notes.py
Update db_notes.py
1 add new tables note_message, note_tag, note_user_note_relation,
  note_discussion, note_discussion_post
2 remove tables note_favorite, note_chat
3 define notedb interface
Update notes.py
Merge with note database version 0.1

Merge remote-tracking branch 'upstream/master'
add menu and base view files
add menu and some base pages
Update notes.py

beta1.0
1 add subscription interface
Merge branch 'master' of https://github.com/mazilian/lms299
1 add discussion interface