Rename Carton to Cask
Rewrite Makefile in order to use Cask
Fix .travis.yml for Cask
Fix .travis.yml: Set variable CASK
Remove submodule tools/el4t
Fix Cask URL in .travis.yml
Install/update Emacs before Cask installation
Simplify .travis.yml
Add ERT in Cask
Fix .travis.yml syntactic error
Fix .travis.yml: should work even if EMACS_PPA=""
Test with ubuntu-elisp/ppa
Add "make before-test"
Fix .travis.yml: "Unable to locate package emacs-el"

See:
https://travis-ci.org/tkf/emacs-request/jobs/20235543
Fix "make test-all"
Style fix in .travis.yml
Use --force-yes with apt-get install

See:
https://travis-ci.org/tkf/emacs-request/jobs/20236447
Merge branch 'cask'