Merge pull request #5 from myakura/spike_geolocation

remove UNKNOWN_ERROR from the list of PositionError.code can take

geolocation.html

@@ -141,7 +141,6 @@ <h2 id=errors>Handling Errors</h2>
 <li><code>PERMISSION_DENIED</code> (<code>1</code>) if the user clicks that &#8220;Don&#8217;t Share&#8221; button or otherwise denies you access to their location.
 <li><code>POSITION_UNAVAILABLE</code> (<code>2</code>) if the network is down or the positioning satellites can&#8217;t be contacted.
 <li><code>TIMEOUT</code> (<code>3</code>) if the network is up but it takes too long to calculate the user&#8217;s position. How long is &#8220;too long&#8221;? I&#8217;ll show you how to define that in the next section.
-<li><code>UNKNOWN_ERROR</code> (<code>0</code>) if anything else goes wrong.
 </ul>
 
 <p class="legend top" style="padding-left:8.5em"><span class=arrow>&#x21b6;</span> Be gracious in defeat