Minor XNIO re-org for 1.2.0

For XNIO 1.2.0, I’m doing away with the separated API versus standalone JAR. My original notion was that the standalone JAR would contain the whole API, plus the Xnio bootstrapping class, plus at least one implementation (NIO right now, as that is currently the only complete implementation). But I think it will be simpler going forward to just add Xnio into the API itself, and ship an API JAR plus one JAR per implementation. So from now on (including any future snapshots), the JARs will follow this new structure instead.

Written on October 16, 2008