Merge pull request #3 from Harvard-University-iCommons/develop

Looks good!
Merge branch 'develop'

* develop:
  fixed secure.py.example; updated production settings.
Merge branch 'develop'

* develop:
  added production gunicorn config file
Merge branch 'develop'

* develop:
  moved the LTI OAuth credential values into env-specific configs; in production, pull those values from secure.py
  make the reserves link “disabled” by default — this will make it show up as greyed-out in Canvas, and instructors can choose to drag it into the active navigation
added example of how to specify LTI credentials in secure.py