Further config, not sure I understand caching in travis yet.

.travis.yml

@@ -9,12 +9,11 @@ addons:
       - python
 cache:
   directories:
-    - $HOME/.cask
     - $HOME/.twister
 before_install:
-  #- sudo add-apt-repository -y ppa:ubuntu-elisp/ppa
   # emacs-el ? needed for what?
-  - if [ ! -d $HOME/.cask ];then curl -fsSL https://raw.githubusercontent.com/cask/cask/master/go | python; fi
+  # Install cask and run it to install the emacs dependency packages
+  - curl -fsSL https://raw.githubusercontent.com/cask/cask/master/go | python
   - export PATH="$HOME/.cask/bin:$PATH"
   - cask
 env: