Add new single unicode values and arrange math buttons into sections
Add icon font, styles for icon font, server rule for preview

Replaces the positioned unicode with single piece icons. Doesn't touch Sass or
icons for the equation builder.
Add binary source files for font editing
Add copy:dist task for fonts
Add newly built dist files
Bump version to 0.2.0
Merge pull request #8 from thinkthroughmath/rw/icon-font

Add icon font