Don't add the specular alpha in the model fragment shaders.
Merge branch 'master' of https://github.com/highfidelity/hifi
Check for texture translucency, render translucent mesh parts after opaque
ones, without alpha testing, and with back face culling enabled.
Didn't need to disable depth writes after all (for now).
Merge pull request #1722 from AndrewMeadows/fix-particle-avatar-collisions

Fix particle avatar collisions
Merge branch 'master' of https://github.com/highfidelity/hifi
serve a 301 redirect when trailing slash is missing, closes #1712
Merge pull request #1729 from birarda/trailing-slash

handle trailing slash in HTTPManager
Merge branch 'master' of https://github.com/highfidelity/hifi
Merge pull request #1723 from ey6es/master

Fixes for translucent textures (such as that used in jellyhead.fbx).
Merge branch 'master' of ssh://github.com/highfidelity/hifi into fix-particle-avatar-collisions