Configurable initial/max heap sizes.
Convenient editing of configs through mcctl edit.
Rename --config-dir to --config.
Add mcctl create command to create new instances.
Bring help message up to date.
Don't autostart new instances, and default JAR to minecraft_server.1.8.jar.
Remove redundant info from README.
Add command to delete an instance.
Refuse to start server with a bad config.
Fix reading command results back from server.
Don't print unnecessary whitespace in command results.
Put -Xms and -Xmx options at the start of the Java command line.
Report an error if there's no Java.
Add command to list all available instances.