Don't install requirements.txt in .travis.yml

.travis.yml

@@ -25,8 +25,8 @@ install:
   - pip install coveralls coverage
   - pip install redis
   - pip install escher --pre
-  - pip install -r requirements.txt
   - pip install rednose
+  - pip install .
 # command to run tests
 script: nosetests
 after_success: