diff of changes to Flot 0.7 to support being run on node (with node-canvas)

Flot_0_7.diff

137c137,139
<                 hooks: {}
---
>                 hooks: {},
>               width: null,
>               height: null
687c689,694
<             var c = document.createElement('canvas');
---
>             var c;
>             if (window.Canvas){ // node-canvas is installed
>                 c = new Canvas(canvasWidth, canvasHeight);
>             } else {
>                 c = document.createElement('canvas');
>             }
697c704
<             if (!c.getContext) // excanvas hack
---
>             if (window.G_vmlCanvasManager) // excanvas hack
707,708c714,715
<             canvasWidth = placeholder.width();
<             canvasHeight = placeholder.height();
---
>             canvasWidth = placeholder.width() || options.width;
>             canvasHeight = placeholder.height() || options.height;
748d754
<                 
751d756
< 
862c867
<                 if (w == null)
---
>                 if (!w)
866c871
<                 if (h == null) {
---
>                 if (!h) {