No need the publish the initial filter

There are no active filters initially. Even if the user selects
active filters and refreshes the page, her selection is lost and
the default option, which is inactive, gets selected instead.
Publish an event each time a filter (active or inactive) is updated
Use 'name' property for the filter name

The category name is now set to the 'categoryName' property
of the filter object published in 'filter-selected' event.
Update and simplify module to collect active filters

The implementation is now consistent with the new format of filters
which will be applied in "funnel mode".
Rename collect-filters.js to collect-active-filters.js

The new name reflects the actual responsibilities of the module better.