Merge#2

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Meng1024 wants to merge 3 commits intolambda-land:masterfrom

Meng1024:master

Commits on Nov 16, 2015

Changes on calculate()
Meng1024
committed

Commits on Nov 22, 2015

add methods in DataCollect class and add a Log file
Meng1024
committed

Commits on Nov 23, 2015

Add the StackHandlerTracker file
Meng1024
committed