New UDFs for piggybank (Bin, Decode, LookupInFiles, RegexExtract, RegexMatch, 
HashFVN, DiffDate)

                 Key: PIG-885
             Project: Pig
          Issue Type: New Feature
            Reporter: Daniel Dai
            Priority: Minor

Bunch of UDFs:
1. Bin -- Converts a continuous value into discrete values
2. Decode -- Converts a given attribute or expression into another string 
value, based on the value of the source attribute
3. LookupInFiles -- Check for the existence of an expression in a serial of 
text files
4. RegexExtract and RegexMatch -- Similar to perl regexes
5. HashFVN -- An implementation of FNV hash
6. DiffDate -- Caculate the number of days in between

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