Export AsyncFile. Add asyncfile module to docgen.

doc/lib.txt

@@ -175,6 +175,9 @@ Generic Operating System Services
   This module implements the ability to monitor a directory/file for changes
   using Posix's inotify API.
 
+* `asyncfile <asyncfile.html>`_
+  This module implements asynchronous file reading and writing using
+  ``asyncdispatch``.
 
 Math libraries
 --------------

lib/pure/asyncfile.nim

@@ -7,7 +7,7 @@
 #    distribution, for details about the copyright.
 #
 
-## This module implements asynchronous file handling.
+## This module implements asynchronous file reading and writing.
 ##
 ## .. code-block:: Nim
 ##    import asyncfile, asyncdispatch, os
@@ -30,7 +30,7 @@ else:
   import posix
 
 type
-  AsyncFile = ref object
+  AsyncFile* = ref object
     fd: TAsyncFd
     offset: int64
 

web/website.ini

@@ -59,6 +59,7 @@ srcdoc2: "pure/nimprof;pure/unittest;packages/docutils/highlite"
 srcdoc2: "packages/docutils/rst;packages/docutils/rstast"
 srcdoc2: "packages/docutils/rstgen;pure/logging;pure/asyncdispatch;pure/asyncnet"
 srcdoc2: "pure/rawsockets;pure/asynchttpserver;pure/net;pure/selectors;pure/future"
+srcdoc2: "pure/asyncfile"
 srcdoc2: "pure/md5"
 srcdoc2: "posix/posix"
 srcdoc2: "pure/fenv"