SINGA-236 memory pool#255

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liyuchenmike wants to merge 3 commits intoapache:masterfrom

liyuchenmike:mempool

Commits on Sep 14, 2016

update the memory pool. No fixed size allocation is required. Simplify the APIs
liyuchenmike
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fixed the bug of not reseting the size for CppMemPool Malloc
liyuchenmike
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Refined the CppMemPool Free function, if a block is freed, set the size of the freed block to 0
liyuchenmike
committed