add config for coverage.py

.coveragerc

@@ -0,0 +1,12 @@
+[report]
+exclude_lines =
+    pragma: no cover
+    ^\s*def __repr__
+    ^\s*(el)?if os\.name ==
+    ^\s*raise (RuntimeError|NotImplementedError)
+    ^\s*except ImportError
+[paths]
+source =
+    qubes
+    /usr/lib/python2.7/site-packages/qubes
+    /usr/lib64/python2.7/site-packages/qubes

.gitignore

@@ -1,5 +1,8 @@
 rpm/
 pkgs/
+.coverage
+.coverage.*
+htmlcov/
 *.pyc
 *.pyo
 *~