Restructure project as discussed in #19

- Triadic project's folder structure is introduced: EKElgorithms(algorithms), EKAlgorithmsApp(Xcode project to spec algorithms & see examples), EKAlgorithmsSpecs(specs aka "tests")
- Inside EKAlgorithmsApp two targets are introduced: EKAlgorithmsExamples to see examples (as current EKAlgorithms does it), EKAlgorithmsSpecs - OCUnit-backed target that runs Kiwi specs.
- CocoaPods added to have Kiwi support.
- First spec is written for -[NSArray indexesOfMinimumAndMaximumElements]