Update travis build

Author: garyb

.travis.yml

@@ -8,9 +8,7 @@ install:
   - wget -O $HOME/purescript.tar.gz https://github.com/purescript/purescript/releases/download/$TAG/linux64.tar.gz
   - tar -xvf $HOME/purescript.tar.gz -C $HOME/
   - chmod a+x $HOME/purescript
-  - npm install bower grunt-cli -g
-  - npm install
-  - bower install
+  - npm install bower gulp -g
+  - npm install && bower install
 script:
-  - grunt make
-  - grunt examples
+  - gulp