Get percentage dimensions working for line and bar charts.
Get percentage dimensions working for pie charts.
Don't require specifying a type for subsequent calls to peity.
Recalculate and apply canvas dimensions when redrawing.
Micro-optimisation.
Update pie docs.
Merge pull request #26 from benpickles/percentage-dimensions

Percentage dimensions
Easier CSS targeting of Peity-created <canvas> elements - closes #27.
Version 1.2.0.