Commit work in progress
First pass at moving to Cascading 2.x
More cleanup.

Removed usage of
    new LoggingFlowProcess((HadoopFlowProcess) flowProcess);
Fixed up FetchPipeLRTest to use platform code.
Added clone to the BixoPlatform and updated all operations to use the clone method when emitting tuples
Missed using clone in ProcessRobotsTask
exclude examples/logs from Git
Siwtch ScoredUrlDatumTest to use Hfs vs. Lfs
More fixes for use with cascading 2.x (we have to use 2.2)
Fix up examples to work with Cascading 2.x
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
Run multiple platform tests on FetchPipe