Remove correct/incorrect message, and auto-add in needed markdown for studio
Check to see if a location is valid before displaying it for instructor grading
Merge remote-tracking branch 'origin/master' into fix/vik/studio-oe
Properly increment student attempts
Add test for incrementing student attempts
Fix test
Set default weights
Set a default weight
Merge remote-tracking branch 'origin/master' into fix/vik/studio-oe
Merge remote-tracking branch 'origin/master' into fix/vik/studio-oe

Conflicts:
	common/lib/xmodule/xmodule/combined_open_ended_module.py
Update default handling
Cleanup and change attribute names
Test fixes
Fix reset and score tests
Cleanup how peer grading handles due date
Change error class
Merge pull request #160 from edx/fix/vik/studio-oe

Fix/vik/studio oe