Fix issue #480 with concrete_inheritance and namespace

[jpetitcolas]

Fix issue described:

• Issue with getChildObject() method PropelBundle#162 (wrong repository)
• Concrete Table Inheritance with namespace #480

I did not find how to launch unit tests? When I try to execute them, I got a "bookstore-conf.php file is missing" error.

[jaugustin]

for tests you can let travis to run them for you ;)

If you want to run them in your local env you can folow .travis.yml file
create needed databases
run composer install
./test/reset_tests.sh
phpunit

[willdurand]

Thank you Jonathan.