make sure 'reset' fires events.
use '_resetFilters' in 'configure' instead of 'reset'.
add tests for 'reset'
add tests for 'clearFilters'
removing 'comparator' should set it back to parent's 'comparator'
includes #27
move comparator reset to _resetFilters

- put it behind a param flag
- corrects bug with configure({}, true) not resetting comparator
docs update