Catching up

This release contains various changes. Notably:

1. Adds the --sigquit flag, which sends a SIGQUIT to the gdn process
2. The binary will now exit if supplied with the --help or unknown flag
3. Grootfs stats
4. Other small changes (review commit history)

Brand new shiny thing

This is the inaugural release for the brand new Golang translation of the garden debug tool previously written in bash.