Implemented mean-pooling, output normalization for BC01 and modified ConvRectifiedLinear to allow to chose the pooling type and specify an output normalization to perform.
Included feedback recieved during pull request. Added tests for output normalization class and modified its docstring, corrected bugs and integrated Sina's code for detector normalization.
removed invalid comment
fixed the right doctring, this time...
Deleted a problematic docstring.
Added a sum in the CrossChannelNormalization docstring.
Merge pull request #172 from carriepl/master

Mean-pooling and Output normalization BC01