Specular map support.
Merge pull request #2806 from ey6es/master

Specular map support.
Merge branch 'master' of https://github.com/worklist/hifi
Merge pull request #2807 from PhilipRosedale/master

AirGuitar.js, arrow keys move fwd/back in mirror view
Merge branch 'master' of https://github.com/worklist/hifi
Added more arrow controls to move camera when in mirror mode, new guitar chords.