XD-1019 + Default RetryAdvice to Rabbit MessageBus

Add default advice - 3 attempts and log when exhausted.
XD-1023: Simplify JobDeploy method signature

XD-1008: Add job instance awareness

Fix filing test by requirring pre-deploy
XD-995: Use matcher and hence eventually()
XD-1015 XD UI changes

- Upgrade bootstrap to 3.0.0
- Use LESS CSS authoring to manage bootstrap styles
- Better responsive layout

XD-1000 JobDefinitions Page

- Added JobDefinitions, Deployments and JobExecutions templates, views
- First phase of changes for their views

- Removed debug for wire.js
- Updated the refresh interval to 4s
- Added UI container's margin-top style property
XD-987: HDFS to mongo export job

Create
  - spring-xd-extension-mongodb
  - hdfsmongodb module

Move existing mongo code from hadoop extension to new mongodb one.
Add new TupleItemWriter which allows a specific identity field to be
chosen if required instead of the generated Tuple UUID.