Random CS fixes:
- remove executable param on some files,
- added missing .gitignore files,
- removed some unused `use` calls,
- added missing new lines at end of some files
Fix dependencies in PayumBundle, adjust configuration of that bundle
Fix bug where disabled shipping methods were selectable during checkout.
Add behat tests.
Merge pull request #2107 from stloyd/bugfix/payum_bundle

[RFC] Fix dependencies in PayumBundle, adjust configuration of that bundle
Merge pull request #2105 from stloyd/bugfix/cs_fix

Random CS fixes