making sure all transforms and transitions are using mixins. Added backface-visibility mixin to eliminate screen flicker and shift on hover of transformed elements.
more significant hover state for minimal nav
added backface-visibility mixin
better checks for images before adding to profile grid
Merge branch 'develop' of git://github.com/johnshopkins/machado into develop

Conflicts:
	src/assets/js/templates/profiles/profile-thumbnail.html