Merge cleanup raaz-hash

- hlint fixups and associated refactoring
- refactoring padLength and padding of sha hash family
additional constraints to make raaz work with criterion
Number utilities added in raaz-modular
Word128 with modular arithmetic
Using testBit instead of Shift in powModuloSlow
Added other higher Words
Storable added for Numbers along with tests
Merge modular integer routines

This is an initial merge of modular multiplication and exponentiation
of big integers of given size.
added rule to build tags
Specialized ptr utils
Added HasName
Using HasName instead of Typeable in raaz-benchmarks
Fixed Gadget and Cipher tests to use HasName
Added instances for HasName in hashes
Fixed raaz-hash tests for HasName change
Added HasName instances in raaz-cipher
Fixed raaz-cipher tests
Fixed raaz-cipher benchmarks