update readme with f-droid link
remove spurious showFlashControl boolean
don’t turn screen off while torch is on
Merge branch 'flashlight2' (close #17 again)

* flashlight2:
  don’t turn screen off while torch is on
  remove spurious showFlashControl boolean
  Made torch control optional. Also added check that stock torch app is installed.
prepare merge durka:master
Merge branch 'master' of https://github.com/durka/HallMonitor

Conflicts:
	bin/HallMonitor.apk
	src/org/durka/hallmonitor/ConfigurationFragment.java
	src/org/durka/hallmonitor/DefaultActivity.java