Add cryptographically secure random number generator
Fix russian comments
Add hash-based random number generator
Fix crypto API
Fix method name for cryptorand API
Replaced the "Rand" suffix with "RNG"
Add hash-based cryptographically secure mixer
Fix MixerRNG name
Add DDoc comments
Use dub for lib import instead of pragma(lib,...)
Merge pull request #352 from ilya-stromberg/master

Add cryptographically secure random number generator