Add parse(String) to Compiler

src/de/dhbwstuttgart/core/JavaTXCompiler.java

@@ -78,4 +78,10 @@ public class JavaTXCompiler {
         return ret;
     }
 
+    public SourceFile parse(String source) throws IOException, ClassNotFoundException {
+        SourceFile ret = new JavaTXParser().parse(source);
+        sourceFiles.add(ret);
+        return ret;
+    }
+
 }