Improved plotting and loads more test networks

* Created oodles of prototxt experiments; see https://docs.google.com/a/cellscope.com/spreadsheets/d/1S3DmViIyD87H49MXbUGi3COr3LPYfX9OqccTRnUHrK0/edit#gid=0 to see how they went
* `python/caffe/draw.py`: Draw layer size on graph edges for data, convolutional and fully-connected layers
* `tools/extra/caffe_latest.html`: web page that continually updates with latest Caffe runs; see it at http://cellscopecv.s3.amazonaws.com/caffe/caffe_latest.html
* `tools/extra/plot_training_log.py`: revamped argument parsing, plot multiple log files for `plot_chart_loss_and_train_accuracy()`
* Maybe some other little things