-- Added functionality + junit tests + pig script tests to enable MongoU...

Implementation of MongoUpdateStorage for Pig.

-- Added pig and shell scripts to test MongoUpdateStorage functionality
-- copied over helpers.jar for use in coverting tuples to bag of tuples
-- put examples of MongoUpdateStorage usage in README.md
-- added .crc and .splits to .gitignore
-- use more informative variable names + fixed tabbing/spacing issues