Ready to announce the release ?

[Michael Baessler]

If all necessary updates are in place, I think we can announce the 
uimaj-2.2.1-incubating release.

- The release artifacts are uploaded and works with the mirror
- The website is updated with the latest documentation
- The release artifacts are uploaded to the Maven Incubator repository
- The eclipse update site is in place (but currently not documented !?)
-- Michael