Use coveralls.io to report test coverage

.travis.yml

@@ -20,6 +20,9 @@ install:
 script:
   - tox
 
+after_success:
+  - coveralls
+
 notifications:
   irc:
     channels:

README.rst

@@ -4,6 +4,9 @@ PyNaCl
 .. image:: https://travis-ci.org/pyca/pynacl.png?branch=master
     :target: https://travis-ci.org/pyca/pynacl
 
+.. image:: https://coveralls.io/repos/pyca/pynacl/badge.png?branch=master
+   :target: https://coveralls.io/r/pyca/pynacl?branch=master
+
 PyNaCl is a Python binding to the `Networking and Cryptography library`_,
 a crypto library with the stated goal of improving usability, security and
 speed.

tox.ini

@@ -3,5 +3,8 @@ envlist = py26,py27,pypy,py33
 
 [testenv]
 deps =
+    coverage
     pytest
-commands = py.test
+commands =
+    coverage run --source nacl --branch -m pytest
+    coverage report -m