beta 0.2.0.8

beta 0.2.0.8

• add NaN check-up
• add quantification support for ScaleAdd Op
• add binary to eltwise optimization
• add console logs for quantization tool
• better document for quantization tool
• replace redundant dimension flags with dimension format
• optimize performance of TensorFlow Lite Quantized Convolution
• fix axis support for ONNX softmax converting
• fix getPerformance tool compiling error on Windows