Also build for x86_64
Merge pull request #30 from johankool/x86_64-fix

Also build for x86_64
fixes #29: proper style class reference
tweaks to compass rotation/fade behavior
touch up some problematic constraints
link style spec
be less brittle around style toggling
more bulletproof style toggling w/ cascading
first cut of migration FAQ
clarify layer/view for annotations
add open source link
flesh out FAQ details
Merge branch 'master' of github.com:mapbox/mapbox-gl-cocoa
add iOS version info to FAQ
use new class api
Merge branch 'style-v3'
remove API for listing all style classes
simplify style class toggling with new underlying API
update applied class getter/setter for v3
update layer order getter/setter for v3