add .coveragerc

.coveragerc

@@ -0,0 +1,22 @@
+[report]
+# Regexes for lines to exclude from consideration
+exclude_lines =
+    # Have to re-enable the standard pragma
+    pragma: no cover
+
+    # Don't complain about missing debug-only code:
+    def __repr__
+    if self\.debug
+
+    # Don't complain if tests don't hit defensive assertion code:
+    raise AssertionError
+    raise NotImplementedError
+
+    # Don't complain if non-runnable code isn't run:
+    if 0:
+    if __name__ == .__main__.:
+    if runtime.platformType  == 'win32'
+omit =
+    master/buildbot/test
+    master/buildbot/status/web/templates
+    slave/buildslave/test