Removed --use-mirrors.

.travis.yml

@@ -7,8 +7,7 @@ env:
     - DJANGO=1.6.6
 
 install:
-    - pip install . --use-mirrors
-    - pip install -r sample_project/requirements.txt --use-mirrors
+    - pip install -r sample_project/requirements.txt
 
 script:
     - cd sample_project