Added maven pom.xml files.
Update references to Stratego-Sugar.def and ATerm.def.
Update generated files
Update gitignores
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 'mvn-build'

Conflicts:
	org.strategoxt.imp.testing.ui/.gitignore