added PluginInvokerTest
added TODO
refactored PluginTask to take Signature via constructor
improved message in NullResultError
improved message in ReflexivePluginError
renamed ReflexivePluginError -> PluginInternalError
improved message in FileSystemError
added more specific ReflexiveInternalError
made UnexpectedError extend PluginInternalError
removed already fixed TODO
improved PluginTaskTest
refactored PluginTaskTest
added more tests to PluginTaskTest
removed TODO, DefinedFunctionsCreator is tested via SmoothRunner
removed File.fullPath()
improved TODO text
added better error handling in DefinedFunctionsCreator
added Argument.[implicitArg()/explicitArg()] factory methods, made constructor private
redesigned Type to use TypeLiteral<?> instead of Class<?>
renamed FileList -> FileSet