Intricate v0.6.0

What's Changed

• 0.6.0 by @gabrielmfern in #5

• fix the categorical cross entropy to compute loss and derivatives as it is normally defined to compute
• fix the sum buffer operation that had a problem when setting the local buffer
• add the Mean Bias loss function
• add the Mean Absolute loss function
• improve Intricate's internal code overall to run better and sometimes faster
• add the Nesterov Accelerated Gradient optimizer
• add the Momentum-based optimizer
• add the Adagrad optimizer

Full Changelog: v0.5.0...v0.6.0