Improved Grid styles with gutter
Changed 'processing' to 'not booked yet' 

This is to address user confusion about what 'processing' means - need to make it clear that visit is not booked yet
Merge pull request #24 from ministryofjustice/Leigh_status_not-processing

Changed 'processing' to 'not booked yet'
Re-enable Dartmoor
Merge pull request #21 from ministryofjustice/improved_grid

Improved Grid styles with gutter
Upgraded rails/activerecord per CVE-2014-3514.
Add specs for visit helper
Lead days to exclude current day
WIP exclude weekends
Added a Schedule object to wrap permissible dates and the logic behind them.
Removed unused methods from VisitHelper.
Added a test for prisons that work on weekends.
Assume that no prisons work on the weekends.
Some prisons work on weekends.