add fish bike example image
fix old detect.py default
pycaffe Detector crops with surrounding context

- caffe.Detector learned how to crop windows with context in the R-CNN
  style s.t. the bordero of the network input is a given amount of
  context.
- add --context_pad arg to detect.py for amount of context. Default is
  16, as in R-CNN.
make R-CNN the Caffe detection example
edit detection example, include R-CNN NMS
make selective search proposals with R-CNN configuration
finish R-CNN detection example

- run through and save new output
- collect region proposals with R-CNN configuration (see sergeyk/selective_search_ijcv_with_python)
- call detect.py in GPU mode
- fix NMS plotting: X and Y coords were accidentally exchanged. print scores too.
Merge pull request #482 from shelhamer/rcnn-detector-example

Make R-CNN the Caffe detection example