Fix name of crossent cost per Aniket Vartak's suggestion.
before merge Alex change
Merge branch 'master' of https://code.google.com/p/cuda-convnet2 into develop
Fixed bug in _aggregate that caused it to read invalid memory.
update before merge
Merge branch 'master' of https://code.google.com/p/cuda-convnet2 into develop
Before Adding MaxMarginPairCost