Update ORA docs for GUI and Top Responses
Merge pull request #573 from edx/sylvia/docs/ORA-65

Sylvia/docs/ora 65
Use caching for leaderboard

Fix loading step CSS location
Merge pull request #616 from edx/will/top-scores-fixups

Will/top scores fixups
i18n pull
Added image display in leaderboard
Sync fork
Update leaderboard test for no text submission
Merge pull request #615 from UQ-UQx/master

Added image display in leaderboard
Allow Mathjax(Latex) in Student responses

Currently, Latex rendering is only supported for question prompts in ORA2. This
commit introduces Latex rendering in ORA2 student response, peer assessment
view, self assessment view, grade view, and staff-info view. The reason that
this Latex rendering code is inserted directly into ORA2 is that edx-platform,
does not know when to start Latex rendering for ORA2 views that come in via
AJAX.
adding preview functionality
typo
fix css
compiled css
fix sass script
fix sass