Swift 4 Ready

Swift 4 Ready
Schemes are shared now. So, Carthage is supported.

Easier usage with default parameters

Added default parameters to array extension functions.

Updated to Swift 3.1

Updated to Swift 3
Added macOS, tvOS and watchOS pod targets
Added array extensions to use the methods on arrays like [5, 3, 2].combinations(...) or [3, 4, 6].permutations(...)