Disable the creation of evaluations on the UI side.
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 'FeedbackSessions' into 74673764
Some UI changes for replacing evaluations
Add creating feedback sessions based on templates
Change in wording
Fix some tests
Change tooltip, replace references to instructor evals page
Fix tests
Modifications to tests
Merge branch 'rc' into Feature-OmniComment
Merge branch 'rc' into FeedbackSessions
Merge branch 'FeedbackSessions' into 74673764

Conflicts:
	src/main/webapp/jsp/instructorFeedbacks.jsp
	src/test/resources/pages/instructorFeedbackAllSessionTypes.html
	src/test/resources/pages/instructorFeedbackDeleteSuccessful.html
	src/test/resources/pages/instructorFeedbackEmptyAll.html
	src/test/resources/pages/instructorFeedbackEmptySession.html
	src/test/resources/pages/instructorFeedbackPublishSuccessful.html
	src/test/resources/pages/instructorFeedbackUnpublishSuccessful.html
	src/test/resources/pages/instructorFeedbacksAllSessionTypesWithHelperView.html
add all records link
fixing tests
Change sample data wording, Give tooltips to PC, CC, Use full term Perceived Contribution