an unregistered student can now view/submit feedback sessions for open session
student can now view results of a feedback session
now emails include the links to the unregistered actions
ported login filter to action level check
Merge branch 'dev' into 74749654

Conflicts:
	src/main/java/teammates/logic/core/Emails.java
Merge branch 'rc' into Feature-OmniComment
add all records link
fixing tests
Merge branch 'rc' into Feature-OmniComment
Merge branch 'rc' into Section
Merge branch 'master' into Feature-OmniComment
Merge branch 'master' into Section
Create basic classes for backend search
basic infrastructure in place for not loggedin and unregistered access to pages
Merge branch 'rc' into 74749654
all tests that need to be fixed have been fixed
Basic results layout for search results
StudentCourseJoinAction is functional
Fix panel info
Complete back end search for students