Trying fix travis

Author: pitbulk

.travis.yml

@@ -3,8 +3,11 @@ python:
   - '2.6'
   - '2.7'
 
+pre-install:
+  - 'sudo apt-get update -qq'
+  - 'sudo apt-get install -qq libxml2-dev'
 install:
-  - 'travis_retry pip install .'
+  - 'travis_retry pip install . --use-mirrors'
   - 'travis_retry pip install -e ".[test]" --use-mirrors'
 
 script: