Merge pull request #67 from jasondavis/master

Updated Cron Module styling for Bug #584
Fixes bug #593 where the Unlimited image does not display when quota's are set as unlimited for a feature.
Added a custom colour palette to pChart2 library specifically for ZPanel, this now uses a blue and grey colour scheme to make it easier to differentiate between the pie chart colours. This fixes bug #586.
Fixed Bug #595 (bugs.zpanelcp.com/view.php?id=595) Module pages use a different icon then there default icon on the dashboard!