Fixed a bug getting the colour for the specific data point.
Rounding Issue

Currently pizza uses Math.ceil to show the percentage string this leads to
issues if you remainders as it will always round up.
Set the pie chart percentage accurately using .round instead of .ceil
Merge pull request #26 from seriousfox/rounding_issue

Rounding Issue
Merge pull request #20 from ericroberts/color-fix

Fixed a bug getting the colour for the specific data point for line graphs.