CRM-14325 - adding participants to event from manage groups

If default search profile is set, you cannot reliably add participants
to an event when doing so from the manage group interface.

----------------------------------------
* CRM-14325: when default search profile is set, can't reliably add contacts to event from manage group page
  http://issues.civicrm.org/jira/browse/CRM-14325
Merge pull request #2626 from jmcclelland/participants-to-event

CRM-14325 - adding participants to event from manage groups