d3-timeline setWidth check construction attrs for width before rejecting on behalf of FF

README.md

setWidth was failing for us in FF, even though we had constructed our attempt as entered in the README:

var chart = d3.timeline();

var svg = d3.select("#timeline1").append("svg").attr("width", 500)
  .datum(testData).call(chart);

It looks like setWidth does ask for the attribute as entered during initial construction:

width = gParentItem.attr("width");

So we juggled the tests to include that earlier in the chain, throwing the error if no width value is found.

@slattery @rrotaru

after.js

      function setWidth() {
        if (!width && !gParentSize.width) {
          try { 
            width = gParentItem.attr("width");
            if ( !width ) 
          	throw "width of the timeline is not set. As of Firefox 27, timeline().with(x) needs to be explicitly set in order to render";
          } catch (err){
          	console.log( err );
          }
        } else if (!(width && gParentSize.width)) {
            gParentItem.attr("width", width);
        }
        // if both are set, do nothing
      }

before.js

      function setWidth() {
        if (!width && !gParentSize.width) {
          throw "width of the timeline is not set. As of Firefox 27, timeline().with(x) needs to be explicitly set in order to render";
        } else if (!(width && gParentSize.width)) {
          if (!width) {
            width = gParentItem.attr("width");
          } else {
            gParentItem.attr("width", width);
          }
        }
        // if both are set, do nothing
      }

nice fix, did you ever get around to submitting a PR?