Fixed issue #585. Sort group members by first name or last name in group detail view according to config variable
Merge pull request #589 from normanjaeckel/SortingOnGroupDetailView

Fixed issue #585. Sort group members by first name or last name in group...
New Feature: List of speakers.
Norman, please review this commit

hide and show old speakers via JS
sort order of the list of speaker via JS
Updated template and some minor fixed for list of speakers.

Fixed missing line break. Updated projector slide.
fixed old speaker_list