multi class neural network
add clone and toString func for sample.
BP algorithm tuning
solve confilct
fix mixture of tabs and spaces
fix mixture of tabs and spaces
support profiling in mc-run
reduce one map access in SetValue
adjust neural network - increase performance, add hidden layer offset, add verbose opt, add learning rate discount
debug neural network
Merge branch 'master' of https://github.com/lihang00/hector into lihang00-master
Merge branch 'neural-network' into develop

Conflicts:
	neural_network.go
remove debug info
fix multiclass ann - we missed one class