update license for 'sub' from 37Signals

 On branch master

	new file:   LICENSE
	deleted:    MIT-LICENSE
add 'sub' tools from 37Signals

 On branch master

	new file:   bin/k
	new file:   completions/k.bash
	new file:   completions/k.zsh
	new file:   conf/k/conf.sh
	new file:   conf/k/sync_exclude.list
	new file:   libexec/k
	new file:   libexec/k-commands
	new file:   libexec/k-completions
	new file:   libexec/k-help
	new file:   libexec/k-init
	new file:   libexec/k-sh-shell
	new file:   libexec/k-sync