Add in the ability to specify margins in theme, fixes #18079

This is a simple addition to the dojox/charting/Chart.js file to allow themes to specify chart margins.  It keeps backwards compatibility to the way it behaved previously.
Well, I included it there so people see that you can set it in the theme.
Self-documenting, so to speak.


On Wed, Jun 18, 2014 at 5:39 AM, Christophe Jolif <notifications@github.com>
wrote:

> In charting/SimpleTheme.js:
>
> > @@ -488,6 +488,7 @@ lang.mixin(SimpleTheme, {
> >  	defaultTheme: {
> >  		// all objects are structs used directly in dojox.gfx
> >  		chart:{
> > +			margins: {l: 10, t: 10, r: 10, b: 10},
>
> as we anyway fallback to this in Chart.js do we want to duplicate it here?
> Maybe not worth it?
>
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> <https://github.com/dojo/dojox/pull/114/files#r13906824>.
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