Cucumber features: processing several files at once.
libxmljs was added to dependencies for jUnit XML generation.
Logging functionality  has been moved  outside the RECESS  class; logger
and formatter services  are now passed as  constructor parameters. Tests
were updated accordingly.

- TextFormatter corresponds to old 'text' output format.
- CompactFormatter corresponds to old 'compact' output format.
- JUnitFormatter provides new jUnit XML output functionality.