[4.1] 1bc257d Switch to container-based infrastructure

[Federico G. Schwindt]

commit 1bc257dbc0592023be04cb4473d9af11f329d1b4
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Mon Aug 3 17:53:25 2015 +0100

    Switch to container-based infrastructure

diff --git a/.travis.yml b/.travis.yml
index 8caad42..164ba4b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,8 +3,12 @@ language: c
 compiler:
   - clang
   - gcc
+addons:
+  apt:
+    packages:
+    - python-docutils
 before_install:
-  - sudo apt-get install python-docutils
   - ./autogen.sh
   - ./configure
+sudo: false
 script: 'make -j3 check VERBOSE=1'