Adding GenerateBinTimeUUID and examples

This is a new version of GenerateTimeUUID UDF that returns the UUID
value as a DataByteArray (Pig bytearray type), which is suitable for
storing in C* TimeUUID type columns.

The example data script uses CQL3 and Pig usage example assumes C* 1.2.x
and is using CqlStorage().
Merge pull request #8 from alexh97/master

Adding GenerateBinTimeUUID and examples