Merge pull request #40 from 0xTim/master

Update for Swift 4

Merge pull request #37 from ksmandersen/fix/swift-4-warning

Fixed Swift 4 warning

Merge pull request #36 from ksmandersen/feature/duration-hours

Added support for specifying duration in hours

Merge pull request #31 from BrettRToomey/vapor-2-beta

Updated for Vapor 2.0 beta. Removed Core dependency.

Merge pull request #31 from BrettRToomey/vapor-2-beta

Updated for Vapor 2.0 beta. Removed Core dependency.

Merge pull request #29 from affanshahid/fix-extensions

make Int and Double extensions public

Merge pull request #24 from BrettRToomey/scheduled-jobs

One-off jobs

Merge pull request #21 from BrettRToomey/json

Disabled JSON

Merge pull request #19 from BrettRToomey/travis-macos

Disable Travis macOS builds.

Merge pull request #16 from BrettRToomey/docs-tests-readme

Cleanup and doc updates for minor release.