bump Cocoa for bearing sign/units fixes
refs #318 & #378: OS X install doc tweaks
line-width defaults to 1 (fixes #388)
line-join defaults to miter (fixes #384)
change text-max-angle to accept degrees and convert to radians
Merge pull request #390 from mapbox/text-max-angle-degrees

change text-max-angle to accept degrees and convert to radians
add symbol* properties/keys
merge text and icon buckets/styles

(we're not yet placing together!)