Add a script to create a fake group

This fixes https://github.com/boxen/our-boxen/issues/235 in a more permanent way
Improving echo messages

Also changed to boxen standard of "No message if nothing changes"
update librarian-puppet
update Puppet dependencies
Merge pull request #639 from boxen/update-librarian-puppet-and-puppet-git

Update librarian puppet and puppet git
Rename `module-data` to `module_data`

This came up in rodjek/librarian-puppet#242. A `-` is not a valid
character in module names according to
http://docs.puppetlabs.com/puppet/latest/reference/modules_fundamentals.html#allowed-module-names
In the Modulefile for ripienaar/puppet-module-data, the name actually
contains an underscore.

Thanks @hanjianwei for noticing this and tracking down the naming rules
Merge pull request #640 from boxen/fix-module-data-name

Rename `module-data` to `module_data`
Clarifies where to find the releases

Resolves issue #644
Upgrade puppetlabs-inifile to Release 1.1.1

This supported bugfix release corrects the inifile section header detection regex (so you can use more characters in your section titles).

More details: https://github.com/puppetlabs/puppetlabs-inifile/pull/115
Merge pull request #648 from johnsyweb/upgrade-inifile-1.1.1

Upgrade puppetlabs-inifile to Release 1.1.1
Merge pull request #645 from spuder/patch-1

Clarifies where to find the releases
Add Ruby 2.1.2 to the README
Merge pull request #656 from adamnbowen/patch-2

Add Ruby 2.1.2 to the README
Typo
Merge pull request #658 from gfestari/typo

Typo
bump boxen-xquartz to 1.2.1
Merge pull request #663 from MarkVillacampa/master

bump boxen-xquartz to 1.2.1
Merge branch 'master' of https://github.com/boxen/our-boxen into fix_gid_issue
Changed to an ask for adding to /etc/groups

Bash y/n code adapted from http://stackoverflow.com/questions/226703/how-do-i-prompt-for-input-in-a-linux-shell-script
Upgrade boxen gem to 2.7.0 with Yosemite support

... including dependency on Puppet 3.7