Adding ruby-version file

Adding a ruby-version file specifying ruby 1.9.3. This
should prevent rvm and chruby from attempting to run
chef scripts etc. with ruby 2.0.0 in this directory,
as chef doesn't work with ruby 2 yet.
Some minor updates

Tweaked the environment descriptions

Fixed the environment cookbook version numbers to our current
versions.

Renamed the database_master role to the more appropriate (long-term)
miqly_db_master role
Managing chef-repo with librarian-chef now