Hello,
I found this repo via your blog at http://www.iconoclastlabs.com/blog/rubymotion-analytics-with-mixpanel, but noticed it was out of date.
I ported the guts of the example to work with the latest versions of the Mixpanel cocoapod and RubyMotion. It is available here: https://github.com/mwise/mixpanel-rubymotion-example.
Feel free to fork that repo or link to my example code from the post. It might save someone a few minutes of head-scratching (e.g. #1).
Cheers,
Mark