Automatic inviting in Slack Team for Crystal-JP.
It's very easy to run this service if you had installed Docker your system.
$ docker build -t crystal-jp/slack-invite .
$ docker run -it -p $PORT:8080 crystal-jp/slack-invite
You need to install Crystal compiler.
$ crystal --version
Crystal 0.10.0 [9d59a34] (Wed Dec 23 17:24:02 UTC 2015)
$ crystal deps # Install dependencies
$ crystal build src/app.cr # Compile
$ ./app --port 8080 # Run!