Added recurrence

Merge remote-tracking branch 'origin/master'

# Conflicts:
#	src/controllers/TaskController.php
#	src/messages/de/messages.mo
#	src/messages/en/messages.mo
#	src/messages/fr/messages.mo
#	src/messages/it/messages.mo
#	src/messages/ru/messages.mo
#	src/models/Task.php
#	src/views/task/item.php