<NME> .travis.yml
<BEF> language: python
python:
  - "2.7"
  - "3.3"
script: nosetests

<MSG> try add coverage tracking

<DFF> @@ -2,4 +2,6 @@ language: python
 python:
   - "2.7"
   - "3.3"
-script: nosetests
+install: pip install coveralls coverage
+script: nosetests --with-coverage
+after_success: coveralls

try add coverage tracking