The macro should be defined by compiler rather than by source.

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* refine cublase
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* code refine

* refine cublas

* add GEMME_EX

* add enable_cublas_tensor_op_math doc and add cublasCall
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* fix CublasCall for cuda version
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* fix error
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* fix GEMM_EX to be compatible with gcc 4.8
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* add GEMM_EX
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* to compatiable with gcc4.8
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* feat(platform): lazy initialization of devicecontext in pool

Use std::async(deferer, []{...}) to lazy initialize DeviceContext in Pool

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* Add future includes

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Make all blob info saved in global device context to be thread based.
Meanwhile save thread id in thread local storage in ParallelDo

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This reverts commit 1d91a49d.

* some trivial opt

* remove the fix of lod_tensor and shrink_rnn_memory_op

* refine ShrinkRNNMemoryOp

test=develop

This reverts commit 151e169e.