[Berksfile] Pin mysql to old version

Yes, the mysql cookbook is broken for Debian at the moment..
https://github.com/opscode-cookbooks/mysql/pull/132
[Berksfile] Use master branch of redmine cookbook
[Vagrantfile] Use opscode-debian-7.1 box
[Vagrantfile] Remove weird lsb.codename attribute
[recipe/default] Small corrections
[recipe/default] Include ssl_certificates::default
[travis] add .travis.yml