Deprecation Swift 3

[nissaba]

I used Carthage to build Siesta and the complier got me the following warnings.

Checkouts/siesta/Source/Support/GCD+Siesta.swift:22:59: warning: FUNCTION is deprecated and will be removed in Swift 3, please use #function

Carthage/Checkouts/siesta/Source/Support/Collection+Siesta.swift:83:29: warning: passing 2 arguments to a callee as a single tuple value is deprecated

[pcantrell]

Holding off on Swift 3 changes until Swift 3 itself has stabilized a bit — especially for when all the API renamings are done and dust has settled on the new named parameter defaults.

At that point, we’ll do a complete pass for Swift 3 deprecations and breakages. The deep changes will probably necessitate separate Swift 2/3 branches, but waiting to see where all the details of the release land before deciding that.

[pcantrell]

Also, @nissaba: once Swift 3 has stabilized a bit and we’re ready to cut a Swift 3 branch of Siesta, I would gladly welcome pull requests to fix these sorts of issues!