Used entry points to detect plugins automaticly.
Fixed agenda_item.is_active_slide() with related item and list of speakers
Merge pull request #1156 from normanjaeckel/AutoPlugin

Used entry points to detect plugins automaticly.
Merge pull request #1181 from ostcar/related_list_of_speakers

Fixed agenda_item.is_active_slide() with related item and list of speakers
Merge branch 'stable/1.5.x'