Use requirements/tests.txt for travis

Author: shivamMg

.travis.yml

@@ -2,7 +2,7 @@ language: python
 python:
   - "2.7"
 # command to install dependencies
-install: "pip install -r requirements.txt"
+install: "pip install -r requirements/tests.txt"
 # command to run tests
 script: nosetests --with-coverage
 # upload coverage