Buckets Swift Versions Save

Update to Swift 3 This change updates the library to be compatible with Swift 3. Notable changes include:

• Support for Swift Package Manager
• API changes across the entire project following Swift 3 conventions
• Deployment targets for watchOS and tvOS
• Updated documentation

This release is not compatible with Swift 2. Please keep using Buckets 1.2 for Swift 2 projects.

• Add support for tvOS and watchOS
• Travis CI integration
• Automatic Doc generation

• Update syntax and logic to conform to swift 2.0.
• Trie struct is not generic now and it works with strings only.

Production ready release.