clean incorrect relu test code
relax benchmark milliseconds threshold
Merge pull request #1417 from Yangqing/dev

clean incorrect relu test code
fix relu cudnn test bug
Merge pull request #1432 from Yangqing/dev

fix relu cudnn test bug
Abstract class for indexed data array storage
Prototype for IndirectionLayer
Implementation of IndirectionLayer
A simpliest test case  for IndirectionLayer
Update SimpleIndexedTextFile
New type of IndexedDataReader
IndexedBlobProtos
CLOCK algorithm based cache
Update test cases and fix some revealed bugs
Comment for the new parameter IndirectionParameter
Test caching correctness
Testing with random input