Upgrade minimum RubyMotion dependency to v1.36

I thought it would be helpful to start collecting critical bugfixes for the imminent RubyMotion upgrade.  Is there anything I missed?

Also, it would be great to cherry pick these changes into v1.2.1 release, @clayallsopp.  I'd like a little more time to experiment with the new APIs I wrote before they're set in stone via v1.3.0.