Add siamese hinge functionality to local and import func#3

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jackculpepper wants to merge 3 commits into

local_importfrom

local_import_siamesehinge

Commits on Oct 18, 2014

compute same label from label pair
jackculpepper
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Merge branch 'local_import' of github.com:jackculpepper/caffe into siamesehinge
jackculpepper
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Commits on Oct 19, 2014

modify accuracy layer to take 1 or 2 label blobs; if 2, compute same/not same
jackculpepper
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