Bumping up version number to 1.1.0-SNAPSHOT

This cleans up some version confusion in this project.
Chronologically:
- 1.0.0 in b9339e6062
- 1.0.1-SNAPSHOT in the next commit, 395912413d
- Back to 0.4.0-SNAPSHOT after @pwrose's merge in 7924359ff3
- 0.5.0-SNAPSHOT (without a release) in eb7d47d3e5

So now we're back on track for a 1.1.0 release after BioJava 4.0.0.