Update c3.js and c3.min.js

c3.js

@@ -8087,6 +8087,25 @@
             var start = domain[0], stop = domain[domain.length - 1];
             return start < stop ? [ start, stop ] : [ stop, start ];
         }
+        function shouldDrawTickText(id){
+            if(!$$.config.axis_rotated) return true;
+            var widthLimits = [
+                // Left is width, right is number of tick labels to be removed
+                [-Infinity],
+                [200, 10],
+                [300, 5],
+                [450, 2],
+                [Infinity, 1]
+            ];
+            var divisor;
+            for(var i = widthLimits.length-1; i--; ){
+                if($$.currentWidth > widthLimits[i][0]) {
+                    divisor = widthLimits[i+1][1];
+                    break;
+                }
+            }
+            return !(id%divisor);
+        }
         function generateTicks(scale) {
             var i, domain, ticks = [];
             if (scale.ticks) {
@@ -8222,6 +8241,13 @@
                 }
 
                 text = tick.select("text");
+                
+                if($$.config.axis_rotated && orient === 'bottom') {
+                    text.style('display', function(d, i){
+                        return shouldDrawTickText(i) ? 'block' : 'none';
+                    });
+                }
+                
                 tspan = text.selectAll('tspan')
                     .data(function (d, i) {
                         var splitted = params.tickMultiline ? splitTickText(d, params.tickWidth) : [].concat(textFormatted(d));