update built libs

Author: dchester

package.json

@@ -1,6 +1,6 @@
 {
   "name": "rickshaw",
-  "version": "1.4.4",
+  "version": "1.4.6",
   "dependencies": {
     "d3": "~3.3.6"
   },

rickshaw.css

@@ -231,6 +231,9 @@
 	stroke-width: 1px;
 	stroke-dasharray: 1 1;
 }
+.rickshaw_graph .y_grid .tick[data-y-value="0"] {
+	stroke-dasharray: 1 0;
+}
 .rickshaw_graph .y_grid path,
 .rickshaw_graph .x_grid_d3 path  {
 	fill: none;