Fix for git credentials containing an '=' sign

Thanks @dbussink
Merge pull request #628 from boxen/args-may-contain-equals

Fix for git credentials containing an '=' sign
updated to latest dependencies
update ruby stuff
Merge pull request #633 from boxen/update-deps

Update Puppet and Ruby dependencies
Include Atom editor for all users.
Merge branch 'master' of https://github.com/boxen/our-boxen

Conflicts:
	Puppetfile.lock
Upgrade TextWrangler to version 1.0.6.
Set exec group to user's primary group.