Merge pull request #9 from timanrebel/master

Release 0.5

- Upgrade Mixpanel iOS SDK to version 2.5.0, adding support for A/B-tests
- Fix device tokens not being correctly sent to Mixpanel (for push notifications)
Fix README formatting
Fix README formatting
@3x support for iOS module
Merge branch 'master' of github.com:hyperlab/TiMixpanel
Upgraded andriod Mixpanel SDK to 4.4.0 and support createAlias