E1402. Fix review strategies
Merge branch 'master' of https://github.com/makhavne/expertiza

Conflicts:
	app/models/response.rb
	app/models/response_map.rb
	db/schema.rb
Part I of
merge branch 'master' of git://github.com/makhavne/expertiza into makhavne-master

Conflicts:
	app/models/assignment_team.rb
Part II of
    merge branch 'master' of git://github.com/makhavne/expertiza into master
Fix code that removes previously reviewed submissions from
the set of candidate submissions to review.