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
Merge branch 'refs/heads/our-boxen/master'
Fixed the syntax for Ruby gems.

See https://github.com/boxen/puppet-ruby/issues/94.
Added puppet for Postfix.

Configures the local Postfix instance to send mail via Mandrill. Read the README for usage instructions.