initial commit of relast model generator (and some fixes and improvements)

build.gradle

gradle/wrapper/gradle-wrapper.properties

src/main/jastadd/EcoreAPI.jrag

src/main/jastadd/XMI/XMIPathResolution.jrag

src/main/jastadd/XMI/XMIWriter.jadd

src/main/jastadd/ecore.relast

src/main/jastadd/grammar/EcoreToGrammar.jrag

src/main/jastadd/grammar/EcoreToGrammar.relast

src/main/jastadd/grammar/Grammar.relast

src/main/jastadd/grammar/GrammarPrinting.jadd

...main/java/de/tudresden/inf/st/e2j/parser/EcoreParser.java

src/test/java/de/tudresden/inf/st/e2j/AbstractTest.java

src/test/java/de/tudresden/inf/st/e2j/EcoreFileProvider.java

...test/java/de/tudresden/inf/st/e2j/TransformationTest.java

src/test/java/de/tudresden/inf/st/e2j/parser/ParserTest.java

src/test/resources/ecore/Train.ecore

src/test/resources/ecore/zoo-gen/ACG.ecore

src/test/resources/ecore/zoo-gen/ACME.ecore

src/test/resources/ecore/zoo-gen/ADELFE.ecore

src/test/resources/ecore/zoo-gen/ASM.ecore