Added push notification registration
Renamed method
Send device model, os version, app version
Merge branch 'master' of github.com:mixpanel/mixpanel-iphone
Use union for sending iOS device ids
Added handlePush: method
Merge branch 'en-push'

Conflicts:
	MPLib/MixpanelAPI.m
Update docs for setSendDeviceModel:
$ios prefix for device info, send device info when registering for push
only flush in background when there is something to send
push registration unit test
make push test more rigid
clean up push test
New generated docs
v1.3 readme
Clean up serializer code, handle NSURLs and NaN NSNumbers, as well as unknown objects in sets
v1.3.1 readme: better handling of non-standard datatypes
redesign
new readme and images
fix readme image links