Added Timecop to Gemfile for time based testing
Added conditions on activity schema that starts-every must divide evenly
into 60min, and start time must align with a multiple of starts-every
Modified specs and factories accordingly
One failing spec now involves waiting room not getting properly destroyed...
Specs all passing again - before_create should only be setting an
expiration time if one wasn't being set explicitly.
Removed spurious comments from Gemfile
Added SimpleCov to measure coverage, and added coverage directive to spec_helper.rb