adds a parameter to the LRN layer (denoted as "k" in  [Krizhevsky et al., NIPS 2012])
added support for "k" LRN parameter to upgrade_proto
added matcaffe_demo for the VGG models (RGB input)
added comments to the Matlab demo script
added example usage to the Matlab script
RGB -> BGR in the matlab demo
added a Matlab demo with mean BGR pixel subtraction instead of the mean image subtraction
Merge pull request #1138 from ksimonyan/vgg_models_support

VGG models support