Added Symfony v3 and v4 support and removed Sonata dependencies

• Add utility isGrantedForUser
• Move status check before token extraction on empty conditions

• 1114170 Add FeatureInterface
• 09904c6 Upgrade to PHP 7.0
• 10be64b Include composer.lock
• e25619d Include previous version if class is missing
• fe7cf72 Include missing required argument
• 7eaeac1 Restore generic versions compare
• a0f8777 Remove experimental status
• 6028f7a Removed unused platforms
• 1052c8e Fixed readme license
• a920bc4 Update to version 1.2

• 1a33ceb Use the Fully Qualified Class Name instead of the extension name
• 190b4fb Start bundle documentation
• d14f746 CS fix
• 7c10d8a Added CLI utils
• a01b624 Check for twig/twig before v1.25.0
• eb05a14 Prevent deprecations from blocking inspections
• 000bc55 Update dependencies
• 0b723b2 Add FeatureManager cache change documentation
• 335a340 Include symfony/phpunit-bridge to detect deprecations
• e59b578 Upgrade phpunit
• 4ba186a Travis script improvements
• 6c95c71 Fix coding style
• 07a9e91 Fix wrong repository reference
• a3c452c Add a changelog
• b1ebbb3 Move from deprecated SecurityContext to AuthorizationChecker

• b1410ef Update minimum PHP version to 5.5
• 0f960d0 Require dependency-injection 2.8+ due to xsd
• fbfeb33 Order composer configuration
• f36c883 Fix coding style
• 97e3313 Improve documentation
• 937c87a Remove useless lines
• 7904d0e Include CS check
• 8f9337b Update dependencies
• 851e7e3 CS fixer configuration
• d571912 Added editorconfig configuration
• 96fa361 Add automatic PHPDoc generation using TravisCI
• c4f3a5e Fix required for correct method usage
• 8a38cff FQCN usage + attribute initialization
• fe5f900 Attribute mapping name based on default strategy
• b2131fe Fix phpdoc
• ad30676 Remove not required asterisk
• 9068802 Migration initialization from cw_feature.* to ae_feature.*
• 717ca56 Remove unused Configuration
• 83998b2 Include DI testing utility
• 8acacb9 Add the contribution guidelines file, with a first items proposal
• cefc989 Add phpunit as a dependency to run tests independently

First release