Amend placeholder file extension

Fixes #534
Remove unneeded code from the MySQL example

The `boxen?` method isn't used anywhere in the file. Remove it so that there's less code for people to copy and paste and to generate less confusion as to why there's a method there that doesn't need to be there.
Merge pull request #535 from mattr-/patch-1

Remove unneeded code from the MySQL example
updated ruby deps
added note about clang error and workaround
added ruby 2.1.1
updated puppet deps
fixed the rubies list
Merge pull request #542 from tarebyte/master

Updating base configuration
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Puppetfile.lock
	manifests/site.pp
	vendor/puppet/cache/boxen-puppet-go-1.1.0.tar.gz