Added DocBook feature file.

Signed-off-by: Sebastian Hoß <mail@shoss.de>
Added Java feature file.

Signed-off-by: Sebastian Hoß <mail@shoss.de>
Added Scala feature file.

Signed-off-by: Sebastian Hoß <mail@shoss.de>
Merge branch 'master' of https://github.com/sebhoss/eclipse-feature-files