Added some doc. to the units and connections.
Testing branch
modified stacked dnoising autoencoder
Merge branch 'master' of https://github.com/pakozm/april-ann
Added two new imaging packages
Added some documentation on imaging packets
Merge branch 'master' of https://github.com/pakozm/april-ann
Merge branch 'master' of https://github.com/pakozm/april-ann into ann_graph