Migrate to Swift 2.3 and Swift 3

[suchtomwow]

In order to migrate and test our app to Swift 2.3/3.0 prior to the release of Xcode 8 and iOS 10, all of our dependencies need to be migrated first.

This can be solved by pointing our podfile to those respective Swift 2.3/3.0 branches, but this repo does not appear to have either of those branches.

This blog post contains helpful tips for migrating open source libraries.

[MrAlek]

Hey! Thanks for reminding me, getting this done as soon as possible.

[MrAlek]

Swift 2.3 is now up! Working on 3.0 but that wasn't exactly trivial so will take a while.

[suchtomwow]

Thanks for the quick response!

[MrAlek]

And now 3.0 is done too :) Really happy with some of the renamings but of course they will break some existing code. Should be easy to migrate though. Thanks @suchtomwow for giving me the push to do it :)