Merge pull request #50 from richcreationsrc/engagement-index-views-update

Engagement Index: Updated Views
Images for Gallery icons
Merge pull request #49 from coyote/icons_for_gallery

Adding icons for use in the Gallery (liking, etc).
[nojira] When the value assigned to an action for the Engagement Index is changed by an instructor, the value of previous actions by the students must also be updated.
Merge pull request #53 from coyote/sync_score_values_on_points_change

[nojira] Sync existing student scores with updated engagement point values
[CYB-100] - Updated styling: added box shadow in landing page image, header styling