Add task for generating SVG Icon Fonts

These changes pull in gulp-iconfont to generate SVG Icon Fonts and gulp-consolidate to render a sass partial with the @font-face declaration and classes for your icons.

In this implementation, the classnames of each icon are set to `-#{filename}`.

How this gets used on a real project would vary.
Might be good to comment this out by default as it can screw up things if you have icons of different sizes.