[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
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"