add default global transition vals
Make icon/text-translate-anchor style properties (fixes #118)
Merge pull request #120 from mapbox/translate-anchor

Make icon/text-translate-anchor style properties (fixes #118)
Remove text-slant (fixes #19)
symbol-placement default is "point" (fixes #122)
icon-rotate is a render property, units are degrees (fixes #124)
Merge remote-tracking branch 'origin/mb-pages'