Cleanup of MagicalRecord 2

[tonyarnold]

I've lumped a bunch of project-related changes into one PR:

1. Add build scripts and configuration for Travis CI;
2. Tidy up the structure of the project to be a bit simpler and easier to work with;
3. Integrated a 64-bit build of Expecta (based upon my fork until the PRs are merged with the 'real' version of Expecta);
4. Makes version information available via +[MagicalRecord version], +[MagicalRecord displayVersion] and +[MagicalRecord build]

It's all pretty harmless stuff, and shouldn't impact on existing users of the source. Developers integrating the Xcode project as a subproject will need to update their file references to the project file.