update travis setup

Author: tonini

.travis.yml

@@ -1,19 +1,17 @@
-language: erlang
+language: elixir
+elixir: 1.0.5
 otp_release:
-   - 17.1
+  - 18.0
+cache: apt
 env:
-  - EMACS=emacs24 EMACS_REPO=cassou/emacs TEST_RUN="rake test"
-  - EMACS=emacs-snapshot EMACS_REPO=ubuntu-elisp/ppa TEST_RUN="rake test-no-gui"
+  - EVM_EMACS=emacs-24.3-bin
+  - EVM_EMACS=emacs-24.4-bin
+  - EVM_EMACS=emacs-24.5-bin
 before_install:
-  - sudo add-apt-repository -y ppa:$EMACS_REPO
-  - sudo apt-get update
-  - sudo apt-get -y install $EMACS
-  - cd /tmp
-  - wget https://github.com/elixir-lang/elixir/releases/download/v1.0.0/Precompiled.zip
-  - unzip Precompiled.zip
-  - export PATH="$PWD/bin:$PATH"
-  - cd -
-  - curl -fsSkL https://raw.github.com/cask/cask/master/go | python
-  - export PATH="/home/travis/.cask/bin:$PATH"
+  - curl -fsSkL https://gist.githubusercontent.com/tonini/09a8bec7a0b2c219e0d7/raw > travis.sh && source ./travis.sh
+  - evm install $EVM_EMACS --use --skip
+  - cask
+install:
+  - cask install
 script:
-  - $TEST_RUN
+  - rake test