Beautify JS-code and add .jshintrc

src/js/.jshintrc

+{
+    "browser": true,
+
+    "indent": 4,
+    "eqeqeq": true,
+    "undef": true,
+    "curly": true,
+    "eqnull": true,
+    "noarg": true,
+    "bitwise": true,
+    "forin": true,
+    "newcap": true,
+
+    "unused": "vars",
+    "quotmark": "double",
+
+    "globals": {
+        "Pebble": false,
+        "toString": false,
+        "console": false
+    }
+}