Add script to speedtest imagenet (currently broken as FilterNet ignores
Caffe::phase()).
Add tests for phase filtering according to Caffe singleton phase
(currently failing as FilterNet ignores the singleton phase).
Fix speedtest (and possibly other tools) by setting the net phase to the
current Caffe::phase() unless explicitly specified in the state.
Merge pull request #840 from jeffdonahue/fix-net-speedtest

Fix speed test tool (and possibly others); add script to speedtest imagenet