subscirbe course, delete bzgl. zwischentabelle angepasst, approve coursy
by trainer, twitter service task, logging bei einigen klassen eingebaut,
etc.
Merge branch 'master' into devRest

Conflicts:
	src/main/java/wfm/task/LoginTask.java
	src/main/resources/diagrams/SCCMS_dev.bpmn
local changes reagarding diagram and merge