fix phpdoc detail detected by scrutinizer
increase test coverage and fix a bug in TagSubscriberPass
#126 remove unused priority handling from cache control subscriber
Merge pull request #127 from ck99/#126_remove_unused_priority_handling

#126 remove unused priority handling from cache control subscriber
Merge pull request #125 from FriendsOfSymfony/increase-test-coverage

increase test coverage and fix a bug in TagSubscriberPass
applied codestyle fixer to remove unused imports and align phpdoc
Update link to milestones

This was changed with the recent GitHub upgrade.
Add ProxyTestCase
Add documentation
Fix config and add docs
Fix undefined index
Fix config key name
Fix test