PIG-885: New UDFs for piggybank (Bin, Decode, LookupInFiles, RegexExtract, RegexMatch, HashFVN, DiffDate) (daijy)
PIG-868: added strin manipulation functions (bennies via olgan)
PIG-273: addition of Top and SearchQuery UDFs (ankur via olgan)
PIG-246: created UDF repository (olgan)
PIG-245: UDF wrappers for Java Math functions (ajaygarg via olgan)
PIG-277: UDF for computing correlation and covariance between data sets (ajaygarg via olgan)