Revert "Add the Scala version number to the artifact id."

This reverts commit 07b00e413d185c53332118711ff12be75f4df994.

Conflicts:
	org.scala-refactoring.library/pom.xml

decreasing Tycho to 0.12
Progess with the strong tycho/junit dependencies
re-ordering plugin repositories (helps with mirror configurations)
Sanity bump of maven-javadoc-plugin