Update travis yaml file

Author: Dan

.travis.yml

@@ -1,13 +1,12 @@
 language: python
 python:
-  - "2.6"
   - "2.7"
 install:
   - pip install -r requirements.txt
-  - pip install coveralls
-script: nosetests --with-coverage --cover-package=pssh
+script: nosetests --with-coverage --cover-package=pssh tests
 notifications:
   email:
     on_failure: change
 after_success:
+  pip install coveralls
   coveralls