Record coverage

.gitignore

@@ -3,3 +3,4 @@ __pycache__/
 _build/
 .tox/
 *.egg-info/
+.coverage

.travis.yml

@@ -9,7 +9,10 @@ env:
     - TOX_ENV=pep8
 
 install:
-    - pip install tox
+    - pip install tox coveralls
 
 script:
     - tox -e $TOX_ENV
+
+after_success:
+    - coveralls

tox.ini

@@ -2,8 +2,8 @@
 envlist = py26,py27,pypy,py32,py33,docs,pep8
 
 [testenv]
-deps = pytest
-commands = py.test
+deps = pytest-cov
+commands = py.test --cov=cryptography/
 
 [testenv:docs]
 deps = sphinx