add prototype poly1305 cbits
add poly1305 .h
add Poly1305 module (non-exposed)
Add working implementation of poly1305 with 1 test vector.
faster one-pass auth call.
add chunking tests and fix a buf with partial buffer
fix sign-ess warning with string constants
fix generate dst offset. not used anyway for now
Add Salsa20 cipher. most is copied from the ChaCha implementation
Merge remote-tracking branch 'origin/poly1305'
Merge branch 'salsa'

Conflicts:
	README.md
	cryptonite.cabal
	tests/Tests.hs
fix empty loop in poly1305 for final case