Improvements#37

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MFlisar wants to merge 3 commits intomalmstein:masterfrom

Commits on Dec 12, 2016

SimpleMediaFensterPlayerController
MichaelFlisar
committed
added some common functions of both controllers to the common interface, namely `boolean isShowing()` and `boolean isFirstTimeLoading()`
MichaelFlisar
committed
removed some temp. code
MichaelFlisar
committed