applySelection for filters (part 1)
recompute the filters when selected
implemented apply/cancel strategy for filters
Merge pull request #13 from olivier-squid/master

M11
added support for boolean facets grouping in filters
Merge pull request #14 from olivier-squid/master

added support for boolean facets grouping in filters
fixed boolean facet selection
sort boolean facets aphabetically
Merge pull request #15 from olivier-squid/master

sorting boolean facets