* add slice cpu op

* print error var name && print op position

* add exp cpu

* add exp cpu

* add CPU_ARCH info, improve the performance of GEMM1*1s1

* improve the performance of gemm1*1s1_conv_add and gemm1*1s1_conv_add_bn_relu

* improve the performance of slidingwindow_bn_relu,slidingwindow_add,slidingwindow_add_bn_relu,gemm1*1s1_bn_relu,gemm1*1s1_add_relu

* prune faster depthwise

* fix style

1.update CPUContext to probe CPU info 2.improve the performance of SlidingwindowConv3x3s1 and SlidingwindowConv3x3s2 (#1655)

* fix cpu conv_add and conv_add_relu

* fix cpu conv_add and conv_add_relu

* develop nearestinterp op  fix bug in element add close #1647

* remove log
remove log

* fix memcpy size in opencl fetch kernel

* add opencl Scale op

* Fix memory leak if tensor was created outside of global scope

* Fix gemv bugs

* Clear no persistable tensor array before predicting, fix crash when predicting with gpu debugging mode

* Fix code style

* Add fetch API for java, refine android log