* refactor register mechanism, current so size: 1.20MB. test=develop

* fix KernelRegistry::Global().Create. test=develop

* fix cpplint errors. test=develop

* fix test_subgraph_pass bug. test=develop

* register kernel with target,precision,datalayout combination. test=develop

* fix test_paddle_api no op found bug. test=develop

* enhance comment

* fix lite/kernels/arm/elementwise_compute_test.cc. test=develop

* fix code style

* revert format of unchanged files. test=develop

* fix code format according to cpplint 1.5.1. test=develop

* remove redundant include header. test=develop

* test=develop, support WITH_TESTING=ON on windows

test=develop, modify the path of test_file in build_windows.bat

test=develop, modify the docment of windows compilation

test=develop, modify the document

* test=develop, modify the build_windows.bat

refactor(*): reduce Wsign-compare warning

update reshape op to support multiple input types of shape.
priority: input(ShapeTensor) > input(Shape) > attr(shape)

update slice op to support multiple iput types of starts and ends.
priority: input(StartsTensor) > input(StartsTensorList) > attr(starts)

add slice op, reshape op,  reshape2 op, squeeze op and squeeze2 op and their unittests for x86