travis: Use new faster build infrastructure

.travis.yml

@@ -1,8 +1,18 @@
+sudo: false
+
 language: python
 
 python:
   - "2.7_with_system_site_packages"
 
+addons:
+  apt:
+    sources:
+      - mopidy
+    packages:
+      - graphviz-dev
+      - mopidy
+
 env:
   - TOX_ENV=py27
   - TOX_ENV=py27-tornado23
@@ -11,10 +21,6 @@ env:
   - TOX_ENV=flake8
 
 install:
-  - "wget -O - http://apt.mopidy.com/mopidy.gpg | sudo apt-key add -"
-  - "sudo wget -O /etc/apt/sources.list.d/mopidy.list http://apt.mopidy.com/mopidy.list"
-  - "sudo apt-get update || true"
-  - "sudo apt-get install mopidy graphviz-dev"
   - "pip install tox"
 
 script: