Airbnb Swift Style Guide Files

What's Changed

• Add rule that protocol composition type aliases should be sorted alphabetically by @calda in https://github.com/airbnb/swift/pull/227
• Add rule that else statements should start on the same line as previous closing brace by @calda in https://github.com/airbnb/swift/pull/229
• Add rule to add a linebreak before the else keyword in a multi-line guard statement by @calda in https://github.com/airbnb/swift/pull/228
• Add rules to discourage #file and #filePath by @jqsilver in https://github.com/airbnb/swift/pull/231
• Add package keyword to list of declaration categories by @calda in https://github.com/airbnb/swift/pull/232
• Add rule to omit internal keyword from declarations with internal access control by @calda in https://github.com/airbnb/swift/pull/233
• Add rule to prefer for loops over functional forEach { ... } method by @calda in https://github.com/airbnb/swift/pull/234

Full Changelog: https://github.com/airbnb/swift/compare/1.0.4...1.0.5