Merge tag 'v0.1.7' into develop

 - Added unique and persistent application identifier

API:
 - Export and document ping route
 - Endpoints now give more data:
   - Image metadata
   - Extracts configuration informations
 - Updated doc and tests

Front:
 - Finished first experiment
 - Check WebSocket configuration
 - Redirect to config if disconnected from server
 - Fixed WebSocket message sender

package.json

@@ -1,6 +1,6 @@
 {
   "name": "expe-web",
-  "version": "0.1.6",
+  "version": "0.1.7",
   "private": true,
   "scripts": {
     "server:start": "node -r esm server/index.js",