Meta-model updated based on our last meeting
- removed SchedulingSpecification
- added PeriodicTrigger
Added trigger to different places (based on our yesterday's agreement)
- TaskTriggerListener.trigger
- Task.invoke
- Executor.execute
Merge remote-tracking branch 'origin/newgen' into newgen-bures

Conflicts:
	jdeeco-core/src/cz/cuni/mff/d3s/deeco/scheduler/LocalTimeScheduler.java
	jdeeco-core/test/cz/cuni/mff/d3s/deeco/scheduler/SchedulerTest.java
Merge remote-tracking branch 'origin/newgen' into newgen-bures

Conflicts:
	jdeeco-core/src/cz/cuni/mff/d3s/deeco/executor/SingleThreadedExecutor.java
Bugfix.
Merge pull request #89 from d3scomp/newgen-bures

Changes agreed on the last meeting