setup nose for testing

.coveragerc

@@ -0,0 +1,3 @@
+[run]
+branch = false
+omit = wakatime/packages/*

README.rst

@@ -74,3 +74,16 @@ Each plugin also has it's own log file for things outside of the common wakatime
 * **Xcode** type ``sudo tail -f /var/log/system.log`` in a Terminal to view Xcode errors
 
 Check that heartbeats are received by the WakaTime api with the ``last_heartbeat`` and ``last_plugin`` attributes from the `current user <https://wakatime.com/api/v1/users/current>`_ api resource. Saving a file forces a heartbeat to be sent.
+
+
+Contributing
+------------
+
+Before contributing a pull request, make sure tests pass:
+
+    virtualenv venv
+    . venv/bin/activate
+    pip install -r dev-requirements.txt
+    nosetests
+
+Many thanks to all [contributors](./AUTHORS)!

dev-requirements.txt

@@ -0,0 +1,3 @@
+coverage==3.7.1
+nose==1.3.7
+nose-exclude==0.3.0

nose.cfg

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+[nosetests]
+exclude-dir = wakatime/packages
+verbosity=3
+with-coverage = 1
+cover-package = wakatime

setup.cfg

@@ -0,0 +1,6 @@
+[nosetests]
+with-coverage = 1
+cover-package = wakatime
+exclude-dir =
+    wakatime/packages
+    venv