Merge pull request #67 from dcleao/master

[CLEANUP] Changed the site Simple Pie example to not have such a big fon...
[CLEANUP] Added missing sugar methods, on the Context and Scene classes, to access the 'color' and 'size' variables: #getColor, #getSize, #getColorLabel, #getSizeLabel
[CLEANUP] Two interaction related verbs (pvc.Chart#{renderInteractive, renderResize}) to reduce access to private details and make it easier to do these frequent tasks: re-render due to selection/activity changes and re-render due to size changes.
Merge pull request #68 from dcleao/CCC-vars-sugar

[CLEANUP] Added missing sugar methods, on the Context and Scene classes,...
Merge pull request #69 from dcleao/CCC-interaction-verbs

[CLEANUP] Two interaction related verbs (pvc.Chart#{renderInteractive, r...
The extension point "axisLabel_text" of continuous axes was being intercepted, not locked. Yet, a user specified value was never used. The extension point is now totally open.