Checkpoint.
Add IRC notifications
Merge remote-tracking branch 'wikimedia/master'
Merge branch 'master' of github.com:wikimedia/limn into feature/viewport
Checkpoint -- most of the scale machinery works.
Checkpoint -- zooming almost fixed.
Fixes zooming for line and bar charts.
Support __bind__
Fixes CalloutNode hack.
Future-proof Metric with canonicalize(), and support Metric::xColumn
Fixes CalloutNode hack.
Fixes maps, and the ZoomPan node to work with the new scales!
Merge branch 'feature/viewport' into develop

Conflicts:
	src/graph/node/canvas-node.co
	src/graph/node/vis/line-node.co
Fixes imports.
Fixes scatterplot circles on zoom.
Silencio.
Fixes Mobile Device hack.
split out different visualizations on datasources page