Fixed the GPU implementation of EuclideanLoss to report the loss to the top layer
use plt namespace for imshow in filter_visualization.ipynb
[example] fix plt commands in detection
[example] change notebook name metadata to avoid conflict

see https://github.com/ipython/ipython/issues/5686
[docs] update docs generation for notebook metadata
Updated ImageNet Tutorial to reflect new merged train+val prototxt format. Also corrected 4,500,000 iterations  -> 450,000 iterations.
Tried to clarify function of `include' lines and train vs. test network differences
Merge pull request #3 from BVLC/master

update