Optimize Backward Time Complexity to O(MK)#1

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mfs6174 wants to merge 6 commits intoydwen:caffe-facefrom mfs6174:ydwen-face-mod

Commits on Oct 21, 2016

The time complexity of the backward process of the center loss layer is now O(MK) instead of O(NMK); fix the code style to pass the lint test.
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add details regarding the modification into README.md
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fix README.md
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Commits on Nov 7, 2016

not setting the diff to zeros in Backward(), allowing the gradient to accumulate when iter_size > 1
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Commits on Dec 15, 2016

add normalize layer to help training center loss
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Commits on Jan 11, 2017

add normalize layer header
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