added logging and renamed system property for #13
added test data isolation via convention (each test has its own data directory in "src/test/resources/generator-tests/") and refactored GeneratorWorkflowTestBase to adopt this convention
moved transformation test classes into transformation package
fixed Xtend compiler warnings regarding unused imports and unnecessary type casts
added new Sculptor property "java.codeformatter.error.abort" (default "false") to abort code generation if invalid Java code is detected during Java code formatting
added new generator test which uses the model and properties from library example project
added missing ".join()" to the end of expressions returning a map