Spacing and Tabbing reported by Travis CI, 2nd pass.

c3.js

@@ -1041,7 +1041,7 @@
             return translate;
         }
         function getArcRatio(d) {
-            var whole = __gauge_style == 'arc' ? Math.PI : (Math.PI * 2);
+            var whole = __gauge_style === 'arc' ? Math.PI : (Math.PI * 2);
             return d ? (d.endAngle - d.startAngle) / whole : null;
         }
         function convertToArcData(d) {
@@ -2843,7 +2843,7 @@
             updateLegend(mapToIds(c3.data.targets), {withTransform: false, withTransitionForTransform: false});
 
             /*-- Main Region --*/
-            if (c3.data.targets.length == 0) {
+            if (c3.data.targets.length === 0) {
                 main.append("text")
                   .attr("class", CLASS.text)
                   .attr("x", (main[0][0].parentNode.width.baseVal.value / 2) - margin.left)