Instructions to test-drive unreleased code

#42 
I agree with @kylef. We should try to avoid this causing a confusion and support nightmare in future. However I am myself am not really an expert with gemfile, so you guys will have to give me a few days to understand everything and get this right.

**Or**

If any of you have some time, then please send a PR to my fork explaining all this and then I can merge it and then we can finally merge it to master?

**Or**

Just answer my 2 quick questions to really give me a push in gem world
* Why we didn't need to include CLAide a few days back to get Swift pods working?
* How do we really know how many gems we include? All 5? Just 3 or 4 and which one?