Update to Swift 3.0

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.

Minor language fixes

1.2.1

Bump version

1.2.0

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

1.1

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

1.0.1

Production ready release.

0.1.7

Fix Carthage scheme detection