changing Carnegie's help tab to a mailto
Merge pull request #132 from Stanford-Online/giulio/carnegie-help-link

Change Carnegie's help tab to a mailto
  Change to CME Reg requirements:

    Previously, Speciality was dependent on Patient Population.
    This change makes Speciality independent of Patient Population
    and thus becomes always visible.
Merge pull request #133 from Stanford-Online/dcadams/cme_reg_changes

  Change to CME Reg requirements:
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.