added doc for page size
improved docs of R.Write.Unsafe
SHA1: Template Haskell removed, fixes #72
SHA256: Template Haskell removed, fixes #72
SHA512: Template Haskell removed, fixes #72
Cabal: Template Haskell removed, fixes #72
Merge branch 'x-issue72' of github.com:abhijaju/raaz into x-issue72