Bumped version number to 4.15.1-SNAPSHOT

dist/vis.js

@@ -4,7 +4,7 @@
  *
  * A dynamic, browser-based visualization library.
  *
- * @version 4.15.0
+ * @version 4.15.1-SNAPSHOT
  * @date    2016-02-23
  *
  * @license

dist/vis.min.js

@@ -4,7 +4,7 @@
  *
  * A dynamic, browser-based visualization library.
  *
- * @version 4.15.0
+ * @version 4.15.1-SNAPSHOT
  * @date    2016-02-23
  *
  * @license

package.json

@@ -1,6 +1,6 @@
 {
   "name": "vis",
-  "version": "4.15.0",
+  "version": "4.15.1-SNAPSHOT",
   "description": "A dynamic, browser-based visualization library.",
   "homepage": "http://visjs.org/",
   "license": "(Apache-2.0 OR MIT)",