fixed comipilation errors
replaced bare Java code with Xtend-based in Model Handling Rules
model handling via the Viatra API
added new API calls
followed modifications in the VIATRA API
DSL improvements

removed action from pattern, removed annotations, added branching
operator
Update README.md
modified the DSL example model
API v1
enhanced DSL + test model
added multiplicity to event-typed parameters

+new example models
a myriad of changes...

-DSL improvements: no explicite model declaration, correct package
handling, IQ pattern references, minimal validation
-example projects for the case study (EMF metamodel, IncQuery project)
restructured the DSL part
restructured the core part
Update README.md
Update README.md
Update README.md