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

bump boxen-xquartz to 1.2.1
Upgrade boxen gem to 2.7.0 with Yosemite support

... including dependency on Puppet 3.7
Upgrade puppet modules for Yosemite support
Merge pull request #664 from boxen/yosemite

OS X 10.10 Yosemite support