Created by: tagliala
Hi guys,
another opinionated PR, you may want to use another solution (such as use an actual 32px icon).
I've noticed that on non-retina displays, the navbar toggler icon is blurry.
The actual available size of the navbar toggler icon is 30px, but the SVG uses a 32 unit grid. This commit uses a 30 unit grid and updates icon accordingly.
The following images shows before and after this PR on non-retina macbook air 1st browser: Chrome 55 2nd browser: Safari 10.0.2 3rd browser: Firefox 50.1.0
