Raven installation
Add initial raven/sentry support
Upgraded Flask to support raven/sentry
Version bump for cum flow, sentry
Add configurable funnel view with backlog markers and drag-and-drop reordering.

1. Fixed erroneous .conf to be .cfg
2. Initial wiring up of view for #147
3. #147 Version bump for funnel epic
4. #147 State validation for view
5. #147 Given one or more workflow states specified in configuration, provide a view of all the cards in that state, regardless of team
6. #147 Default ordering to FIFO based on when the card entered that State
7. #147 PEP8ery
8. #147 Allow for drag-and-drop reordering to override FIFO
9. #147 Given a configured daily Throughput number, place backlog markers every N cards incremented by a day
10. Don't display backlog markers with weekend days, increment to the next work day
11. #147 Fixed test failure caused by emptying Order field for cards in non-orderable states upon save
12. #147 Helper script to pull data on exit counts from sates, useful for setting Funnel throughput config values
13. #147 PEP8-ery
14. #147 Removed useless test of mongoengine itself
Merge branch 'funnel' Fixes #147