bug in capital hex digit checking fixes #191.
Cleaned tests of raaz-cipher by using fromHex
Cleaned benchmarks of raaz-cipher by using fromHex
Removed some spurious inlines and extensions
Merge some test cleanup.
Cleaned some table lookups and added relevant strictness
EqWord class added
Using fromIntegral instead of ghc internals
some documentation touch up.
rearranged some source code.
Merge added EqWord class.

The resulting equality operator === is timing resistant.