Update cs.yml

Added untranslated strings from en and translated to cs.
Merge pull request #2764 from prokopsimek/patch-2

Update cs.yml
Specify ruby required version via Refinery::Version.required_ruby_version.

Use it in all gemspecs.
Let's support Ruby 2.0 again.
Migrate rspec-rails ~> 3.0.
Merge pull request #2765 from refinery/dry-ruby-required-version

Specify ruby required version via Refinery::Version.required_ruby_version.
Merge pull request #2766 from refinery/use-rspec-3

Migrate rspec-rails ~> 3.0.
Merge pull request #2767 from refinery/allow-ruby2-again

Let's support Ruby 2.0 again.
Fixes #2768 by using the right i18n namespace.
Merge pull request #2769 from refinery/fix-issue-2768

Fixes #2768 by using the right i18n namespace.
Restored custom_slug functionality, fixes #2761
Merge pull request #2770 from refinery/fix-issue-2761

Restored custom_slug functionality, fixes #2761
Update cs.yml

What about this? It's more beautiful.
Merge pull request #2771 from prokopsimek/patch-3

Update cs.yml
We want to make sure that we CI Ruby 2.2
Update .travis.yml

use `rvm 2.0.0` instead of `rvm 2.0`
Update cs.yml
Merge pull request #2775 from prokopsimek/patch-4

Update cs.yml + missing key in en.yml
Merge pull request #2773 from refinery/ruby-2-2-ci

We want to make sure that we CI Ruby 2.2
Increase dummy application performance by providing a rake task dependency chain.