add reserved types

i2p2www/pages/site/docs/spec/common-structures.html

 {% extends "global/layout.html" %}
 {% block title %}{% trans %}Common structures Specification{% endtrans %}{% endblock %}
-{% block lastupdated %}{% trans %}January 2016{% endtrans %}{% endblock %}
+{% block lastupdated %}{% trans %}February 2016{% endtrans %}{% endblock %}
 {% block accuratefor %}0.9.24{% endblock %}
 {% block content_nav %}
 <table border=1>
@@ -449,13 +449,22 @@ The defined Signing Key types are:
 <td>Recent Router Identities and Destinations</td></tr>
 <tr><td>EdDSA_SHA512_Ed25519ph</td><td align="center">8</td><td align="center">32</td><td align="center">0.9.25</td>
 <td>Offline only; never used in Key Certificates for Router Identities or Destinations</td></tr>
+<tr><td>reserved</td><td align="center">65280 - 65534</td><td align="center"></td><td align="center"></td>
+<td><i>Reserved for experimental use</i></td></tr>
+<tr><td>reserved</td><td align="center">65535</td><td align="center"></td><td align="center"></td>
+<td><i>Reserved for future expansion</i></td></tr>
 </table>
 
 <p>
 The defined Crypto Public Key types are:
 </p><table border=1>
-<tr><th>Type</th><th>Type Code</th><th>Total Public Key Length</th></tr>
-<tr><td>ElGamal</td><td align="center">0</td><td align="center">256</td></tr>
+<tr><th>Type</th><th>Type Code</th><th>Total Public Key Length</th><th>{% trans %}Since{% endtrans %}</th><th>{% trans %}Usage{% endtrans %}</th></tr>
+<tr><td>ElGamal</td><td align="center">0</td><td align="center">256</td><td align="center">0.9.12</td>
+<td>All Router Identities and Destinations</td></tr>
+<tr><td>reserved</td><td align="center">65280 - 65534</td><td align="center"></td><td align="center"></td>
+<td><i>Reserved for experimental use</i></td></tr>
+<tr><td>reserved</td><td align="center">65535</td><td align="center"></td><td align="center"></td>
+<td><i>Reserved for future expansion</i></td></tr>
 </table>
 
 <p>