Install analytics repo from a SHA _not_ a tag

The v0.1 tag was mistakenly removed from upstream. While attempting to
restore it, it was restored to point to an earlier, incorrect
SHA/object.

Git does not support "renaming" of tags (changes to existing tags are
ignored), so environments which still had a local, cached copy of the
original tag were unaffected. Fresh installs were broken.

This change pins the version to the original source SHA, instead of a
tag.
Merge pull request #137

from stvstnfrd:analytics
into Stanford-Online:master
Add student submission reports, management and dashboard functionality
Merge pull request #127 from Stanford-Online/kluo/student-submission-reports

Add student submission reports, management and dashboard functionality
Support and tests for adding a reset button to units

* Users may want to start anew when answering a question. This commit decouples reset from randomization while still preserving backward compatibility. Users can clear their input.
* Instructors can set course-wide and problem-specific settings for reset button display.