Implemented communication with iremix when auto-awarded a STEAM badge, as well as emails to learners/guardians when awarded a STEAM badge.
Documenting new environment variables.
Removing call to health check stub for iRemix, so that it doesn't lie to us about how incredibly healthy it is.
Fixing openbadger test by adding fake environment variables for iRemix.
Merge pull request #644 from christensenep/197-steam-badge-email

Implement STEAM badge award emails