coverage: run in parallel & combine afterwards

This merges the results reported for 'python/afdko' and '*/site-packages/afdko'

.coveragerc

@@ -2,6 +2,7 @@
 # measure 'branch' coverage in addition to 'statement' coverage
 # See: http://coverage.readthedocs.io/en/coverage-4.5.1/branch.html
 branch = True
+parallel = True
 
 # list of directories or packages to measure
 source =

.gitignore

@@ -11,7 +11,9 @@ dist/
 .idea/
 
 # coverage data
+# DO NOT use '.coverage*' because that matches '.coveragerc'
 .coverage
+.coverage.*
 htmlcov
 .pytest_cache
 
@@ -27,9 +29,6 @@ spot
 tx
 type1
 
-# ignore the Windows compiled programs
-*.exe
-
 # ignore the temp build directories and files
 *.o
 *.a

.travis.yml

@@ -58,6 +58,7 @@ matrix:
         - python -m pip install --user -U --force-reinstall dist/*.whl
         - python -m pip install --user -r requirements-dev.txt
         - pytest --cov
+        - coverage combine
         - python -m pip uninstall --yes afdko
       after_success:
         - codecov