Node's parent property
Node bugs fix; Tests for Node's parent property
Node update event propagation feature
Error recovery mechanism minor improvements
Test framework resource dir customization feature
Project configuration improved
Parser debug utilities moved to main
Minor contextualizer issues fixed
Recovery rule improved
Recovery rule minor improvement
Merge branch 'jar-and-improvements'

 - AST improvements:
   - Node's reference to it's parent.
   - Update event propagation up to root.
   - Node numeration order bug fixed.
 - Error recovery minor improvements.
 - SBT configuration major improvement.
 - Artifacts can be published to Sonatype.