Added maven pom.xml files.
Update generated files
Update gitignore
Adapt to new language build.
Fixes for two-stage build and cleanup.
Made strj and the generator Java projects. Remove dependence on strategoxt.jar for everything.
Update generated build file.
Merge branch 'master' into mvn-build

Conflicts:
	org.metaborg.meta.lang.nabl/META-INF/MANIFEST.MF
Fix missing comma