* add normalize switch to box_coder_op

* add default prior box var

* update according to the review

add host_memory_profiling_cn.md

enable infer api with multi-threads

fix test error in fluid_benchmark.py

fix protobuf memory leak

Fix dangling pointer bug in paddle/fluid/framework/executor.cc

refine benchmark/fluid

Faster RecordIO Scanner

* Auto generate python api for polygon_box_transform op.

* Add unitest.

* Modify optimizer in new API to support more usecase

* Modify CMake to include only modified examples

fix build error on mac

Fix term core only

Fix single pserver transpile error after merging

Update open files op

support recordio in dist train