update travis / dockerfile

Author: sph3rex

.travis.yml

@@ -1,5 +1,5 @@
 sudo: required
-language: python
+
 services:
   - docker
 

docker/Dockerfile.tests

@@ -7,4 +7,4 @@ WORKDIR /code
 
 RUN apt-get update \
     && apt-get install -y build-essential mpich \
-    && pip install -r requirements.txt
+    && pip install --progress-bar off --requirement requirements.txt