0.7.0-beta.1

This release is meant for use with Xcode 7.1 and Swift 2.1.

Improved

• Update to Swift 2 (#30, #31, #32, #35, #38). Thanks @jpsim, @mrackwitz, @neilpa and @ikesyo!
• Add a CommandRegistry.main() variant which takes explicit arguments array (#33). Thanks @natestedman!
• Rename CommandOf to AnyCommand for consistentency with the standard lib (#37). Thanks @ikesyo!

Fixed

• Reflect Result's parameterized error to documentations (#36). Thanks @ikesyo!

Thank you to @mdiep, @jpsim, @ikesyo, @jdhealy and @neilpa for reviewing PRs!