elaborate test cases in help spec
add groovy-library build init type
groovyfy LanguageLibraryProjectDescriptor
Some fixes & tweaks on the groovy-library templates
missed committing test class for LanguageLibraryProjectInitDescriptor
Add scala-library init type

- use scalatest as testing framework in scala-library
- did some renamings on integTests to reflect renaming of setup to init
cleanup groovy init build.gradle template