added Raaz.Core.hs
moved the memory module to Raaz.Core hierarchy
move parse/write into the Core hierarchy
moved R.Types to the core hierarchy
move ByteSource to the core hierarchy.
moved Primitives to the Core hierarchy
moved utils to the core hierarchy.
moved Tests to the core hierarchy
Serialize moved to Raaz.Core.
serialize and primitives exposed from Raaz.Core
raaz-hash: changed according to core hierarchy
raaz-cipher: changed according to core hierarchy
raaz-modular: changed according to core hierarchy
raaz-random: changed according to core hierarchy
raaz-benchmarks: changed according to core hierarchy
bin/checksum.hs: changed according to core hierarchy
raaz-core: warnings removed due to redundant imports
minor fix for raaz-modular
Added timing-safe modular exponentiation function (Montgomery Ladder) with tests and benchmarks