ignore .idea files, added show/hide controls methods

.gitignore

@@ -4,3 +4,4 @@ build/
 sftp-config.json
 coverage/
 temp/
+.idea

src/viewer.js

@@ -826,6 +826,13 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
         return this;
     },
 
+    hideControls: function() {
+        beginControlsAutoHide(this);
+    },
+
+    showControls: function() {
+        abortControlsAutoHide(this);
+    },
 
     /**
      * @function