Resolve #1601 by avoiding redundant allocations#1606

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Mikhael-Danilov wants to merge 3 commits intoirungentoo:masterfrom

Mikhael-Danilov:get_rid_of_allocation

Commits on Jul 18, 2016

* vpx_image_t input_frame in VCSession to avoid alloc|free pair for each frame
Mikhael-Danilov
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Commits on Jul 27, 2016

fix pointer type mismatch (tests passes now)
Mikhael-Danilov
committed

Commits on Jul 28, 2016

still need frame data copy here (or we get memory leak on each image size change)
Mikhael-Danilov
committed