make travis slow

we can't use travis' container based infrastructure (sudo: false)
containers disallow the use of sudo which we have to use to install dependencies

.travis.yml

@@ -1,11 +1,10 @@
-sudo: false
 language: node_js
 node_js:
   - "0.10"
 before_script:
   - cp "modules/config.example.js" "modules/config.js"
 before_install:
-  - apt-get install libcairo2-dev libjpeg8-dev libpango1.0-dev libgif-dev build-essential g++
+  - sudo apt-get install libcairo2-dev libjpeg8-dev libpango1.0-dev libgif-dev build-essential g++
 notifications:
   irc:
     channels: