Add LICENSE and README.
Initial checkpoint.
Refactor into cubism_source.
Don't skip the first refresh.
More convenient metric interface.
Add context.shift.
Arithmetic for metrics.
Checkpoint horizon chart.
Cleaner metric composition using method chaining.

Also, change the implementation of time shifting to correctly handle daylight
savings time, where there can be discontinuities.
Relocate context.constant.
Fix a bug in metric.shift.
Constant.shift is a noop.
Configurable extent.
Display metrics as soon as they are available.
Fix another bug in metric.shift.
Fix d3 declaration.
There's an off-by-one (or two) here somewhere.
Major overhaul.
Add comparison chart.
Pretty sure there's an off-by-one here.