make a .coveragerc, move config there, some no cover declarations / exclude some code

.coveragerc

@@ -0,0 +1,30 @@
+# .coveragerc to control coverage.py
+
+[run]
+branch = True
+source = nsupdate
+omit =
+    */migrations/*
+    */_tests/*
+    nsupdate/wsgi.py
+
+[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__.:
+
+ignore_errors = True
+

.travis.yml

@@ -6,9 +6,8 @@ install:
     - "pip install --upgrade --use-mirrors -e ."
     - "pip install coveralls"
 env: SECRET_KEY=justfortravis
-script: "coverage run --source nsupdate --omit '*/migrations/*,*/_tests/*' -m py.test --pep8"
+script: "coverage run -m py.test --pep8"
 after_success:
-    - coveralls debug
     - coveralls
 notifications:
     email:

nsupdate/__init__.py

@@ -5,7 +5,7 @@ nsupdate - dynamic DNS service
 import re
 
 
-class Version(tuple):
+class Version(tuple):  # pragma: no cover
     """
     Version objects store versions like 1.2.3a4 in a structured
     way and support version comparisons and direct version component access.