Add pre_answer to ring groups.

git-svn-id: http://fusionpbx.googlecode.com/svn/trunk/fusionpbx@3771 e2954ef0-caed-11de-bd98-e341d93cc3cc
Add pre_answer to local_extension dialplan.

git-svn-id: http://fusionpbx.googlecode.com/svn/trunk/fusionpbx@3772 e2954ef0-caed-11de-bd98-e341d93cc3cc