First release of Spiking Network simulator

Features

Added neurons models:
- IF neuron
- LIF neuron
- LIF neuron with adaptive threshold
  *each model has in-build literal inhibition option
Added one type of he connections between neurons:
- All to all type
Added simple STDP model as local lerning rule for unsupervised training of the SNN
Added functions for lables assignment and traning accuracy evaluation for unsupervised training of the SNN
Added functions for visualization of yhe network data
Added some useful tools

Assets 2