Readied POM for Maven Central release

You'll need to create an account and do the various fiddling described here:

https://docs.sonatype.org/display/Repository/Sonatype+OSS+Maven+Repository+Usage+Guide

Then you can do a release to Maven Central thusly:

```
mvn release:prepare -Dsign.key=YOUREMAIL
mvn release:perform -Dsign.key=YOUREMAIL
```

where YOUREMAIL is whatever you used to identify your GPG key (usually your email address).

Then you have to go to https://oss.sonatype.org/ click "Staging Repositories", find your staged artifacts, select them, click "Close", type in whatever as description, wait 10 seconds, click Refresh, select your artifacts again, click "Release", type in more blah blah description, and you're done. Things will then be on their way to Maven Central.

All of this is covered in more detail, with screenshots, in the link above.