Fix keyboard (Space or Enter) operation of buttons. Fixes #2888. Supercedes #2889#3032

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OwenEdwards wants to merge 2 commits intovideojs:masterfrom OwenEdwards:fix/split-clickables-from-buttons

+230-82

Commits on Jan 25, 2016

Separate button functionality into clickable-component and pure button component.
OwenEdwards
committed
Couple of small changes based on gkatsev's feedback.
OwenEdwards
committed