removed clear() from graph2d docs

docs/graph2d/index.html

@@ -1001,18 +1001,6 @@ function (option, path) {
             <th>Return Type</th>
             <th>Description</th>
         </tr>
-        <tr>
-            <td>clear([what])</td>
-            <td>none</td>
-            <td>
-                Clear the Graph2d. An object can be passed specifying which sections to clear: items, groups,
-                and/or options. By Default, items, groups and options are cleared, i.e. <code>what = {items: true, groups: true, options: true}</code>. Example usage:
-
-<pre class="prettyprint lang-js options">Graph2d.clear();                // clear items, groups, and options
-Graph2d.clear({options: true}); // clear options only
-</pre>
-            </td>
-        </tr>
         <tr>
             <td>destroy()</td>
             <td>none</td>

lib/network/modules/Canvas.js

@@ -163,7 +163,7 @@ class Canvas {
     this.hammer = new Hammer(this.frame.canvas);
     this.hammer.get('pinch').set({enable: true});
     // enable to get better response, todo: test on mobile.
-    this.hammer.get('pan').set({threshold:5, direction:30});
+    this.hammer.get('pan').set({threshold:5, direction:30}); // 30 is ALL_DIRECTIONS in hammer.
 
     hammerUtil.onTouch(this.hammer, (event) => {this.body.eventListeners.onTouch(event)});
     this.hammer.on('tap',       (event) => {this.body.eventListeners.onTap(event)});