Fix up examples to work with Cascading 2.x
Merge branch 'cascading-2.0' of github.com:bixo/bixo into cascading-2.0
Added getNumReduceTasks() to BixoPlatform.

This can be removed once BasePlatform has this support.
Changed the process() interface to take one more parameter - the flow process.
Updated examples to working with Cascading 2.x
Updated contrib/helpful to Cascading 2.x