Update Travis script

Author: mrkkrp

.travis.yml

@@ -1,35 +1,22 @@
 env:
   matrix:
-    - EMACS=emacs24
-    - EMACS=emacs-snapshot
-
-matrix:
-  allow_failures:
-    - env: EMACS=emacs-snapshot
+    - EVM_EMACS=emacs-24.5-travis
+    - EVM_EMACS=emacs-25.3-travis
+    - EVM_EMACS=emacs-26.1-travis
 
 before_install:
-  - git submodule --quiet update --init --recursive
+  - git clone https://github.com/rejeep/evm.git $HOME/.evm
+  - export PATH=$HOME/.evm/bin:$PATH
+  - evm config path /tmp
+  - evm install $EVM_EMACS --use --skip
 
 install:
-  - if [ "$EMACS" = 'emacs24' ]; then
-        sudo add-apt-repository -y ppa:cassou/emacs &&
-        sudo apt-get -qq update &&
-        sudo apt-get -qq -f install &&
-        sudo apt-get -qq install emacs24 emacs24-el;
-    fi
-  - if [ "$EMACS" = 'emacs-snapshot' ]; then
-        sudo add-apt-repository -y ppa:ubuntu-elisp/ppa &&
-        sudo apt-get -qq update &&
-        sudo apt-get -qq -f install &&
-        sudo apt-get -qq install emacs-snapshot &&
-        sudo apt-get -qq install emacs-snapshot-el;
-    fi
   - curl -fsSkL https://raw.github.com/cask/cask/master/go | python
-  - export PATH="/home/travis/.cask/bin:$PATH"
+  - export PATH=/home/travis/.cask/bin:$PATH
   - cask install
 
 script:
-  - cask build
+  - cask build 2>&1 >/dev/null | grep "Error" | wc -l | grep "0"
 
 notifications:
   email: false