Added maven pom.xml files.
Update gitignores
Update generated files
Adapt to new language build.
Merge branch 'master' into mvn-build
Convert terms project to Java project.
Ignore META-INF, since it is now generated.
Change plugin projects that do not depend on Eclipse to regular Java projects.
Exclude performance tests
Fixes for two-stage build and cleanup.
Made strj and the generator Java projects. Remove dependence on strategoxt.jar for everything.
Remove versions from external dependencies and plugins, are now managed by the parent pom.
Update generated build file.