XD-779 Send notifications as serialized Java Objects
XD-784-work in progress
XD-784 - updated gradlew.bat
Fixed package tangle in spring-xd-dirt
Added null check to TupleToJsonStringConverter
XD-790 - Fixed System.exit() test issue
XD-793 Upgrade Spring Data Redis to 1.1 RC1
XD-789 Add index-access for Tuples

+ check for negative index
Rename 'taps list' to 'tap list'
Mover XDContainerLaunchException to launcher package
XD-756: Add a splitter module
XD-757: Add aggregator module and tests
XD-784 - Fixes for Windows compatibility
- Added blank line EOF at gradle.bat
- Fixed tests
Fix JsonStringToObjectTransformer's toString()
- Added pattern matching to replace linefeed '\n'
  incase of non-windows environment
Fix compile warnings
Use HttpSource everywhere. Reactivate dormant tests
Add Mail Sources
Add Mail sink; externalize mail props
Add Mail test fixtures
Tidy up tests, add MailSink support