Fixes - hepspec weights schema integer problem

Pig schema defined hepspec weights as integers, but the underlying tuples (in MyUDF.SiteAvailability) stored String objects.

Due to that the hepspec weights persisted as strings during the final output in MongoDB. 

With fix c624b94233fdb0a2c94b4f06db3e02f8199d1670 weight tuples now contain parsed integers and they persist as integers in MongoDB as well.