Re: Is MINA 1 can be replaced by MINA 2 in openfire

I succeded in updating the Mina library to the version 2.0.7 and I sent a pull request in https://github.com/igniterealtime/Openfire/pull/16.

There were some compatibility problems in two cases:

1. There is no more the ExecutorThreadModel in the acceptor. Instead, we need to add an ExecutorFilter. It was sucessfully migrated.
2. In the JMX there were some changes hard to cover, like the absent of IoSessionStat class and the mbean.startCollectingStats method. It needs a review.