[models] adding zoo readme; caffenet, alexnet, and rcnn models in zoo format
snapshot model with caffemodel extension
proofread model zoo
removing unneeded scripts from imagenet example
Renaming CaffeNet model prototxts and unignoring models/*
updating feature extraction example
removed mention of getting_pretrained_models page and old paths
minor fixes to docs
flickr style fine-tuning model (separated from example read me)
script to upload/update model info as gist
add SILENCE layer -- takes one or more inputs and produces no output

This is useful for suppressing undesired outputs.
Merge pull request #624 from jeffdonahue/squash-layer

SILENCE layer -- takes 1 or more inputs and produces no output (kudos to @longjon for fixup)
fix model download advice and prototxt name for fine-tuning
[example] update ImageNet timing for K40
Merge pull request #917 from sergeyk/model_zoo

Define standard format for Caffe models to open the "model zoo"
HDF5 classification example