Adds icons as icon font

- Removes icon SVGs
- Adds icon font as base64 encoded WOFF
- Adds CSS for symbol definitions
- Extends .icon css for pre-defined sizes
- Replaces SVGs in navbar with icon font
- Updates icons to have thicker outlines for better visibility at
smaller sizes

Sorry, probably should have broken up these commits.
Adds another neutral

- Moves the very pale “light-gray” to “pale-gray”.
- Adds a “weak” text color, one level darker than “muted”
- Adds hover and base color to nav bar icons
Remove extraneous space
Remove extraneous line
Remove empty lines
Merge pull request #86 from chexee/chexee-icon-font

Adds icon font discussed #204