modular partitioning filter for scenarios
fixing typos
adding --help text
cleanup
changing command line option for partitioning test suite
fixing broken unit tests
typo fix
adding a cucumber test for partitioning feature
some specs and one more cucumber test
cleanup spec
Merge remote-tracking branch 'jon/parallel'

Conflicts:
	lib/cucumber/ast/filter.js
	lib/cucumber/cli/configuration.js
	spec/cucumber/cli/configuration_spec.js