First stab at documenation

Update Lua and Luasocket version in samples and in documentation
Documented ipv5_v6only default option being set
Documented tcp6 and udp6
Documented dns.getaddrinfo
Documented zero-sized datagram change?
Documented getoption

doc/http.html

@@ -36,7 +36,7 @@
 
 <!-- http +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
 
-<h2 id=http>HTTP</h2> 
+<h2 id="http">HTTP</h2> 
 
 <p>
 HTTP (Hyper Text  Transfer Protocol) is the protocol  used to exchange
@@ -119,7 +119,7 @@ the HTTP module:
 
 <!-- http.request ++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
 
-<p class=name id=request>
+<p class=name id="request">
 http.<b>request(</b>url [, body]<b>)</b><br>
 http.<b>request{</b><br>
 &nbsp;&nbsp;url = <i>string</i>,<br>
@@ -256,7 +256,7 @@ r, c, h = http.request {
 -- }
 </pre>
 
-<p class=note id=post> 
+<p class=note id="post"> 
 Note: When sending a POST request, simple interface adds a
 "<tt>Content-type: application/x-www-form-urlencoded</tt>"
 header to the request. This is the type used by
@@ -264,7 +264,7 @@ HTML forms. If you need another type, use the generic
 interface.
 </p>
 
-<p class=note id=authentication> 
+<p class=note id="authentication"> 
 Note: Some URLs are protected by their
 servers from anonymous download. For those URLs, the server must receive
 some  sort of  authentication along  with the  request or  it will  deny