Added postgres_ext to gemfile
LTSCLASREQ-61, LTSCLASREQ-62 partial - Updating to support arbitrary numbers of sessions, etc.
Most display HTML "adjusted."  Pretty bad, but does not error. Forms untouched, massive refactoring ahead.

Mostly, this is intended to preserve existing functionality with the new DB; should not be considered fully baked.
First successful multi-section create. Good guys win!
Form deconstruction begun! More or less works, but deeply inelegant.
Missing association.
LTSCLASREQ-62 - filter empty sections out of create, add ordering to summary view
Deleted duplicate association
LTSCLASREQ-57 - Replace duped IDs with classes, and make sure IDs for requested_dates are not duped
Doc improvements suggested by Bobbi in code review
Drop to two requested dates, remove SuperAdmin field for direct status manipulation (since it does not work anyway)
Also check actual_date before filtering out sections
LTSCLASREQ-69 - Remove Harvard-specific language from assessments
Cleanup - mostly changing old find(:all syntax to wheres, etc.
Language update re:Emilie email
Attempt at replacing timeframe logic in controller with session logic.
More view stuffs
LTSCLASREQ-75 - Crash on closing course, added more development-only tools for investigative coding.
LTSCLASREQ-70 - First pass at Assessments page and CSV dump
Update to dev notes and README.