Use Maven 3.0.4 as minimum required version. Bump dependencies.
Replace javadoc tags by annotations in mojos.
Get rid of deprecated classes (e.g. ArtifactFactory).
Solve a blocker bug - the localRepository field is not being injected after bumping to Maven 3 - it makes impossible to use "clover:instrument" goal.
Drop support for Maven 2 as it's reached end of life: