Updated README.md.
Added StreamCipher protocol.  Start work on Salsa20.
Added little endian support to word-bytes and bytes-word.
Salsa20 implementation complete.
CTR mode and stream cipher work.
API work.
Work on stream cipher modes.
Stream Modes complete.
Docs update.
Docs update.
Docs update.
Work on API for vectors of bytes.
All padders now work with vectors of bytes.
API converted to use vector of bytes.
Stream mode complete for all ciphers.
Merge branch 'master' into v0.1.0-release