Adds coveralls.io config

Adds coveralls to test-requirements.txt
Adds coveralls to after_success section in .travis.yml
Adds coveralls badge to README.rst

.travis.yml

@@ -5,4 +5,6 @@ install:
   - pip install -q -r requirements.txt --use-mirrors
   - pip install -q -r test-requirements.txt --use-mirrors
 script:
-  - python setup.py testr
+  - python setup.py testr --coverage
+after_success:
+  - coveralls

README.rst

@@ -1,2 +1,4 @@
 .. image:: https://travis-ci.org/jistr/python-tuskarclient.png?branch=master
    :target: http://travis-ci.org/jistr/python-tuskarclient
+.. image:: https://coveralls.io/repos/jistr/python-tuskarclient/badge.png
+   :target: https://coveralls.io/r/jistr/python-tuskarclient

test-requirements.txt

@@ -11,3 +11,6 @@ mock
 sphinx>=1.1.2
 testrepository>=0.0.13
 testtools>=0.9.26
+
+# for coveralls.io web service
+coveralls