Changes for 1.3.0
Update README with libsodium changes
Update CHANGES with license change
Rename libsodium 0.5.1 -> 0.6 in documentation
Use scrypt_ll whenever possible
Fix docstring referring to constant length
Refactor libsodium loading order
Merge branch 'b1.3.x'

Conflicts:
	pylibscrypt/__init__.py
Version 1.3.0