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-784 - updated gradlew.bat
XD-784 - added blank line EOF gradlew.bat
Modifications to tests for Windows compatibility