Partially implemented BlockChecks
Created stubs for all CheckStylefeatures

Features are labelled with 
- DONE, when implemented
- TBD, when not yet implemented.

Current statistics:
- CheckStyle has 128 features
- DONE: 13
- TBD: 115
Clean up
Reorganizing examples, added features.
Merge branch 'master' of https://github.com/cwi-swat/rascal.git