Xitrum 2.4

[Ngoc Dao]

I've just released Xitrum 2.4:
https://github.com/ngocdaothanh/xitrum/blob/master/CHANGELOG

This release is mainly for updating Hazelcast from 2.5 to 2.5.1:
http://www.hazelcast.com/docs/2.5/manual/multi_html/ch18s04.html

The other 2 changes:
* #115 Replace Javassist with ASM to reduce the number of dependencies
* #121 Update Twitter Chill to 0.2.1

To update Xitrum from 2.3 to 2.4, in your build.sbt just change "2.3"
to "2.4".

[Ngoc Dao]

I've added this dependency graph to the Xitrum Guide:
http://ngocdaothanh.github.io/xitrum/guide/deps.html

It's generated by:
https://github.com/jrudolph/sbt-dependency-graph