Added description of keyboard equivalents

Author: kbwood

demos/datepicker/default.html

@@ -24,6 +24,17 @@
 <div class="demo-description">
 
 <p>This is a default datepicker which is tied to a standard form input. The calendar opens in a small overlay onFocus and closes automatically onBlur if a date if selected.</p>
+<p>You can also use the keyboard to drive the datepicker:</p>
+<ul>
+	<li>page up/down - previous/next month</li>
+	<li>ctrl+page up/down - previous/next year</li>
+	<li>ctrl+home - current month or open when closed</li>
+	<li>ctrl+left/right - previous/next day</li>
+	<li>ctrl+up/down - previous/next week</li>
+	<li>enter - accept the selected date</li>
+	<li>ctrl+end - close and erase the date</li>
+	<li>escape - close the datepicker without selection</li>
+</ul>
 
 </div><!-- End demo-description -->