Remove moot `version` property from bower.json

Per bower/bower.json-spec@a325da3

Also their maintainer says they probably won't ever use it: http://stackoverflow.com/questions/24844901/bowers-bower-json-file-version-property

bower.json

@@ -1,6 +1,5 @@
 {
     "name": "jquery.nicescroll",
-    "version": "3.6.0",
     "main": [
         "./jquery.nicescroll.js",
         "./zoomico.png"