In travis, directly apt-get redis and start command changed

.travis.yml

@@ -11,15 +11,7 @@ python:
   - "nightly" # currently points to 3.6-dev
 # command to install dependencies
 before_install:
-  - sudo apt-get install build-essential
-  - sudo apt-get install tcl8.5
-  - wget http://download.redis.io/releases/redis-2.8.3.tar.gz
-  - tar -xvzf redis-2.8.3.tar.gz
-  - cd redis-2.8.3
-  - make
-  - sudo make install
-  - cd ..
-  # - apt-get install redis-server
+  - sudo apt-get install redis-server
 install: 
   - "pip install -r requirements.txt"     
   - "pip install -e ."