* fix: when use the load model from memory mode, the RAM occupy is high

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* ligth mem reuse
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* fix cpplint
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* add set_not_owned function for graph

* add scope set. test=develop

* add scope_ptr enforce not null before setting.test=develop

1. infernce multi card occupy
2. facebox model inference occupy too much
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refine trt first run
add quant dequant fuse pass
omit simplify_anakin_priorbox_detection template
omit transpose_flatten_concat_fuse template
test=develop

* modify the interface of Pass::Allay
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* Polish code
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* Fix Travis CI
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* fix Pass::Apply interface
test=develop

* Fix Travis CI
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size_t is an unsigned integer, with a conversion rank
 larger than int, therefore in the following expression
 the int value was promoted to size_t, making it a
 subtraction of unsigned values. The result of such
 a subtraction is also an unsigned value.

1. graph and program_desc alignment
2. trt stream

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* Initialize the elementwise plugin.

* Implement the basic CUDA kernel of elementwise plugin.
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the parameters will load from CPUPlace, that will keep copying data
between CPU and GPU places.

test=develop