speedup maybe?

.travis.yml

@@ -1,12 +1,19 @@
 language: ruby
 
 cache:
+  apt: true
   bundler: true
   # Cache nanoc directories
   directories:
     - output
     - tmp
 
+addons:
+  apt:
+    packages:
+      - pandoc
+      - texlive-full
+
 branches:
   only:
   - master
@@ -21,10 +28,6 @@ before_install:
   -in id_rsa.enc -out deploy_key -d
 - echo -e "Host zeus.ugent.be\n\tStrictHostKeyChecking no\n" >> ~/.ssh/config
 - npm install
-- sudo apt-get update -qq
-- sudo apt-get install -y pandoc
-- sudo apt-get install -y texlive-full
-- sudo apt-get install -y texlive-xetex
 script:
 - bundle exec nanoc --env=prod
 - bundle exec nanoc --env=prod check --deploy