Added performance notes to documentation

doc/html/index.html

@@ -70,6 +70,8 @@
 <dt><span class="section"><a href="boost_optional/tutorial/exception_safety_guarantees.html">Exception
       Safety Guarantees</a></span></dt>
 <dt><span class="section"><a href="boost_optional/tutorial/type_requirements.html">Type requirements</a></span></dt>
+<dt><span class="section"><a href="boost_optional/tutorial/performance_considerations.html">Performance
+      considerations</a></span></dt>
 </dl></dd>
 <dt><span class="section"><a href="optional/reference.html">Reference</a></span></dt>
 <dd><dl>
@@ -134,7 +136,7 @@
 </div>
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
-<td align="left"><p><small>Last revised: November 21, 2014 at 23:32:40 GMT</small></p></td>
+<td align="left"><p><small>Last revised: December 06, 2014 at 18:09:45 GMT</small></p></td>
 <td align="right"><div class="copyright-footer"></div></td>
 </tr></table>
 <hr>