Fix links to Travis
Added graphviz and routing bricks
Sequence generation scheme
Background color of graphviz
Add requirements.txt back
Install markupsafe
Mention Groundhog examples in the basic tutorial
Merge branch 'master' of github.com:bartvm/blocks
Fix a small bug in the scheme
Monitor simplification
Merge branch 'master' into train_and_monitor
Datasets, iterators, and a few minor edits