Fixed tar mission's Quick reference page
Fixed closing p tag in line 42
Merge pull request #295 from eeshangarg/bug-1008-fixed-tar-mission-reference-page

Fixed tar mission's Quick reference page
Use Oppia explorations for the tar mission.
Tick the progress boxes on completion of the step.
Remove tests that are no longer required. Fix other failing tests.
Remove unused code.
Adds csrf token to oppia player's eventhandler post requests.
Merge pull request #301 from sunu/tar-oppia-2

Oppia-fied tar training mission revisited
Add csrf tocken to post request that resets mission state.
Merge pull request #303 from sunu/mission-reset-csrf

Add csrf token to post request that resets mission state.