Add a script to create a fake group

This fixes https://github.com/boxen/our-boxen/issues/235 in a more permanent way
Added boxen upgrade instructions
Added more detailed update process
Moved Upgrading instructions to FAQ
fixed spelling error
Update README.md

Other boxem fixed.
Merge pull request #587 from nbmorgan/master

Added boxen upgrade instructions
Upgrade puppet-git to 2.3.1

Closes #598
Suppressing error message when CLTools not installed

On Mavericks you can install full Xcode and Boxen, but then you get this line every time you run `boxen` on the command-line:

    No receipt for 'com.apple.pkg.CLTools_Executables' found at '/'.

This minor bugfix suppresses the message.
update Ruby and Puppet Deps
Merge pull request #613 from boxen/update-deps-06-03-2014

Update Ruby and Puppet Deps
Merge pull request #607 from walling/master

Suppressing error message when CLTools not installed
Revert "Merge pull request #607 from walling/master"

This reverts commit 1aea2e02c1a8d641bc7f7c6e58d7faaf13cb1696, reversing
changes made to db3d1de5f8ab587fcbad6813edfb7ce52d21ad96.
update puppet-ruby
Merge pull request #615 from boxen/update-ruby

Update puppet-ruby
Improving echo messages

Also changed to boxen standard of "No message if nothing changes"
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