Add ejabberd 2.1.2 release notes

SVN Revision: 2913

doc/release_notes_2.1.2.txt

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+                              Release Notes
+                             ejabberd 2.1.2
+
+  ejabberd 2.1.2 is the second bugfix release in ejabberd 2.1.x branch.
+
+  ejabberd 2.1.2 includes several bugfixes.
+  More details of those fixes can be retrieved from:
+     http://redir.process-one.net/ejabberd-2.1.2
+
+  The new code can be downloaded from ejabberd download page:
+     http://www.process-one.net/en/ejabberd/
+
+
+  The major changes are:
+
+* Core
+- Close sessions that were half connected
+- Fix SASL PLAIN authentication message for RFC4616 compliance
+- Fix support for old Erlang/OTP R10 and R11
+- Return proper error (not 'conflict') when register is forbidden by ACL
+- When ejabberd stops, send stream close to clients
+
+* ejabberdctl
+- Check for EGID in ejabberdctl command
+- Command to stop ejabberd informing users, with grace period
+- If there's a problem in config file, display config lines and stop node
+
+* MUC
+- Kick occupants with reason when room is stopped due to MUC shutdown
+- Write in room log when a room is created, destroyed, started, stopped
+
+* PubSub and PEP
+- Don't call gen_server on internal event (improves performance and scalability)
+- Fix duplicate SHIM header in Pubsub message
+- Notification messages of Pubsub node config change contained a SHIM header
+- SubID SHIM header missing in Pubsub message with multiple
+  subscriptions on the same node
+- PEP: last published item not sent from unavailable users when the
+  subscription is implicit (XEP-0115)
+- pep_mapping not working due to Node type mismatch
+
+* WebAdmin
+- If big offline message queue, show only subset on WebAdmin
+- Support in user list page of WebAdmin when mod_offline is disabled
+
+
+  Bug reports
+
+  You can officially report bugs on ProcessOne support site:
+  http://support.process-one.net/