rects now have an x_offset and y_offset parameter

the offsets move the plotted glyph a number of pixels in the desired direction.

This is useful for building a grouped column plot.  Otherwise columns for the same x-axis plot on top of each other .

I think embed tool should be removed  at least for now. 



> On Aug 26, 2014, at 8:16, Paddy Mullen <notifications@github.com> wrote:
> 
> In bokehjs/release/js/bokeh.js:
> 
> > @@ -31100,7 +31095,7 @@ define('tool/embed_tool_template',[],function(){
> >                td = $("<td class='bokeh_tooltip_row_value'></td>");
> >                if (value.indexOf("$color") >= 0) {
> >                  _ref4 = value.match(/\$color(\[.*\])?:(\w*)/), match = _ref4[0], opts = _ref4[1], colname = _ref4[2];
> > -                column = ds.getcolumn(colname);
> This change looks worrying. I didn't touch embed_tool, I'm guessing that my branch hadn't kept up with ContinuumIO/bokeh master
> 
> —
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