- Refacto & comments code.

- Normalisation error message for js.
- Manage back button.
- Managa unavailable camera.

www/customCamera.js

@@ -10,10 +10,24 @@ var exec = require('cordova/exec');
 var customCameraExport = function() {
 };
 
+/**
+ * Start custom camera.
+ * 
+ * @param {string} imgBackgroundBase64 Base64 picture for the background.
+ * @param {function} successFct Callback function to success action.
+ * @param {function} failFct    Callback function to fail action.
+ */
 customCameraExport.prototype.startCamera = function(imgBackgroundBase64, successFct, failFct) {
+    var successFctCallback = function(data) {
+        successFct(data);
+    }
+
+    var failFctCallback = function(data) {
+        failFct(data.code, data.message)
+    }
     exec(
-        successFct,
-        failFct,
+        successFctCallback,
+        failFctCallback,
         "CustomCamera",
         "startCamera",
         [imgBackgroundBase64]