Typo in getting mapping files
Fixing typo and completing findMappingFiles method

I think the method was incomplete and contained a typo.
Fix getting bundle path

$bundles array contains only classes, not objects, so we need to instantiate them before getting path.
In $resouces 'type' cannot be equal to $extension, because YmlFileLoader checks for 'yaml' as type, not 'yml'.
Fix loading resources from main config file

$config['mapping'] doesn't have a default value. You can read resources only if mapping section is defined in main config file.
If you have auto routing defined per bundle you dont'have it.
Merge pull request #108 from eiannone/patch-1

Fix getting mapping files