add some transcoding options for libvpx#92

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tvims81 wants to merge 17 commits intostreamio:masterfrom

Commits on Jan 13, 2015

add strict encding option for aac codec
av
committed

Commits on Mar 19, 2015

update profile to video_profile
tvims81
committed

Commits on Jul 14, 2015

Commits on Jul 15, 2015

:resolution to 'resolution'
tvims81
committed

Commits on Mar 22, 2016

Only reject invalid video or audio streams
mziwisky
committed

Commits on Apr 13, 2016

Movie#valid? only requires one supported stream
mziwisky
committed

Commits on Apr 29, 2016

Merge pull request #1 from streamio/master
tvims81
committed

Commits on May 24, 2016

Merge pull request #2 from mziwisky/judicious-stream-validations
tvims81
committed