Add Unit tests

[RJ-Clegg]

Since this project is aimed at beginners and show casing latest iOS development techniques; we should also include unit testing with this project.

Thoughts?

[karmatt]

I definitely agree with this, especially since we are working with an outside API

[squarefrog]

I tried to take a look at this today, however I hit a significant stumbling block. I've never used XcodeGen before, so I have no idea how I'd go about adding the testing targets for this.

Additionally, should there be a testing target for each library? E.g. Area51, CoreAPI, ImageService, or a single target that will allow tests to exercise all dependencies in one place?

Personally, I'd say there is benefit to both approaches, but I'd lean towards a single test target.

[RJ-Clegg]

Closing this as we have started using Unit Testing! 👍