Change version to 0.5.0 since thrust hasn't been deployed to rubygems yet
Manually re-sign the packaged .ipa before deploying to TestFlight.

This is to avoid a bug in xcrun that prevents it from working on Yosemite (see: http://stackoverflow.com/questions/26497863/xcode-6-1-error-while-building-ipa-using-testflight-app)

[fixes #82529780]