Add python coverage module to third_party

third_party/pycoverage/tox.ini

+# Tox (http://tox.testrun.org/) is a tool for running tests
+# in multiple virtualenvs. This configuration file will run the
+# test suite on all supported python versions. To use it, "pip install tox"
+# and then run "tox" from this directory.
+
+[tox]
+envlist = py25, py26, py27, py31, py32, py33, pypy
+
+[testenv]
+commands =
+    {envpython} setup.py --quiet clean develop
+
+    # Create tests/zipmods.zip
+    # Install the egg1 egg
+    # Remove the C extension so that we can test the PyTracer
+    {envpython} igor.py zip_mods install_egg remove_extension
+
+    # Test with the PyTracer
+    {envpython} igor.py test_with_tracer py {posargs}
+
+    # Build the C extension and test with the CTracer
+    {envpython} setup.py --quiet build_ext --inplace
+    {envpython} igor.py test_with_tracer c {posargs}
+
+deps =
+    nose
+    mock
+
+[testenv:pypy]
+# PyPy has no C extensions
+setenv =
+    COVERAGE_NO_EXTENSION=1