Changes

* ''filters'': this object should mirror ''data'' from ''ActivityOptions'' but the values for each fields can be an Array of string, a string or a regexp.An activity will be considered as able to handle an activity only if the filters are all satisfied. An array means OR for each items. If there is no filter value for a field, that means it is always satisfied.

You do not need to pass the same ''ActivityHandlerDescription'' object to have ''registerActivityHandler'', ''unregisterActivityHandler'' and ''isActivityHandlerRegistered'' working. You only need to pass an instance of ''ActivityHandlerDescription'' with the same attribute values.