Revert to puppet-go 1.1.0

This upgrade to 2.0.1 was overlooked when I merged #519, and breaks
things for people who use zsh (see boxen/puppet-go#8).
Use the nodenv layout instead of the old nvm one
Merge pull request #529 from Ledej/fix-sync

Fix the `script/sync` command
Merge pull request #523 from boxen/revert-to-puppet-go-1-1-0

Revert to puppet-go 1.1.0
Amend placeholder file extension

Fixes #534
Remove unneeded code from the MySQL example

The `boxen?` method isn't used anywhere in the file. Remove it so that there's less code for people to copy and paste and to generate less confusion as to why there's a method there that doesn't need to be there.
Merge pull request #535 from mattr-/patch-1

Remove unneeded code from the MySQL example
Merge branch 'refs/heads/our-boxen/master'