4 Fixes in CollisionExample#3

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Nikaoto wants to merge 2 commits intomiko:masterfrom

Nikaoto:collision-example

Commits on Oct 18, 2017

make code more readable and fix grammar mistake
Nikaoto
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fix random obstacle generation - math.randomseed(os.time()) generates different ones after every launch; improve movement (can also be horizontal now); improve collision calculation - previously, t…
Nikaoto
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