[NRRPLT-8102] Bump to 3.1.0

bower.json

 {
   "name": "gz3d-hbp",
   "description": "3D rendering component of gzweb, modified for HBP",
-  "version": "3.0.5",
+  "version": "3.1.0",
   "private": true,
   "repository": {
     "url": "git+ssh://bbpcode.epfl.ch/neurorobotics/gzweb",

package.json

 {
   "name": "gzweb",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "description": "WebGL client for Gazebo",
   "repository": {
     "type": "mercurial",