Updated history and docs

HISTORY.md

@@ -24,6 +24,11 @@ http://visjs.org
 - Event listeners of `update` now receive an extra property `data`, 
   containing the changed fields of the changed items.
 
+### Graph3d
+
+- Implemented options `xValueLabel` and `yValueLabel` for custom labels along
+  the x and y axis. Thanks @fabriziofortino.
+
 
 ## 2014-09-16, version 3.5.0
 

docs/graph3d.html

@@ -419,6 +419,14 @@ var options = {
   <td>none</td>
   <td>Step size for the grid on the x-axis.</td>
 </tr>
+<tr>
+  <td>xValueLabel</td>
+  <td>function</td>
+  <td>none</td>
+  <td>A function for custom formatting of the labels along the x-axis,
+    for example <code>function (x) {return (x * 100) + '%'}</code>.
+  </td>
+</tr>
 
 <tr>
   <td>yBarWidth</td>
@@ -454,6 +462,14 @@ var options = {
   <td>none</td>
   <td>Step size for the grid on the y-axis.</td>
 </tr>
+<tr>
+  <td>yValueLabel</td>
+  <td>function</td>
+  <td>none</td>
+  <td>A function for custom formatting of the labels along the y-axis,
+    for example <code>function (y) {return (y * 100) + '%'}</code>.
+  </td>
+</tr>
 
 <tr>
   <td>zMin</td>