Added push notification registration
Renamed method
Send device model, os version, app version
Initialize outputLength to zero.

This fixes a static analyzer warning in Xcode 4.4.
Merge pull request #29 from jparise/base64-warning

Initialize outputLength to zero.
Catch exception if unarchiving data fails
v1.2.1 readme
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