Update gencredentials for Ruby 2.0
Updated pods

- Pin most pods to a specific version
- Removed SSKeychain
- Updated Mixpanel
Updated WordPressApi pod

- [Improved redirect handling](https://github.com/koke/WordPressApi/commit/5f4f1b771d32229a90529aea6d764b743b2f0786)
- [Better error logging](https://github.com/koke/WordPressApi/commit/7dc17f04bf88fe76f02551af0ede05a9d95fc3af)