Exclude vendorized argparse lib from coverage report.

Makefile

@@ -40,11 +40,11 @@ tar:
 
 test: pre-commit
 	@find . -type f -iname '*.py[co]' -delete
-	tox
+	@tox
 
 test-fast: pre-commit
 	@find . -type f -iname '*.py[co]' -delete
-	tox -e py27
+	@tox -e py27
 
 clean:
 	@find . -type f -iname '*.py[co]' -delete

tox.ini

@@ -18,7 +18,8 @@ deps =
     ipython
     pytest
 commands =
-    coverage run --source=bin/ -m py.test -rxs --tb native -s --strict {posargs:tests}
+    coverage run --source=bin/ --omit=bin/autojump_argparse.py -m \
+        py.test -rxs --tb native -s --strict {posargs:tests}
     coverage report -m