0.7.0 beta

Changelog:

• New ML model architecture in tinychain.ml
• ML models now support AdamOptimizer
• New convenience functions for Tensor: log, mean, round, argmax, argsort, trigonometry functions
• New initializers for Tensor: random_normal, random_uniform
• Improved closure usability
• Improved cache performance
• Improved Stream usability
• Uniform hash function for State

SHA256 checksum: 27524a16a2f6f1cc6429206cfe82a5728c61ef490838ad047e4955f4ae794257