Update the icons on styleguide wiki

[souperneon]

REMOVE

• marker.png
• marker1.png
• key.svg
• key.png
• key_h.png

ADD

• Pin https://github.com/mapzen/styleguide/blob/master/dist/images/pin.svg
• Pin outline https://github.com/mapzen/styleguide/blob/master/dist/images/pin_outline.svg
• Ribbon https://github.com/mapzen/styleguide/blob/master/dist/images/icons/award-ribbon-circle.svg
• Dollar https://github.com/mapzen/styleguide/blob/master/dist/images/icons/dollar-sign-circle.svg
• Map https://github.com/mapzen/styleguide/blob/master/dist/images/icons/folding-map-circle.svg
• Bolt inverse https://github.com/mapzen/styleguide/blob/master/dist/images/divider/bolt-inverse.svg
• Default avatar https://github.com/mapzen/styleguide/blob/master/dist/images/default-avatar.svg

OTHER

• ^ Ribbon, dollar and map are repeated as pricing 1,2 and 3. Pick one naming scheme
• Consolidate compass dividers in the /dividers folder
• Create a section on the styleguide to show the background contour images?