Remove docs subdirectory from coverage, but keep docs/example

Author: iMichka

.travis.yml

@@ -22,7 +22,7 @@ script:
   # Install pygccxml
   - python setup.py install
   # Run the tests with coverage
-  - coverage run --source=pygccxml,docs,unittests unittests/test_all.py
+  - coverage run --source=pygccxml,docs/example,unittests unittests/test_all.py
 
 after_success:
   # Send coverage result to https://coveralls.io/r/gccxml/pygccxml