[build] add ant target autoload, phpunit and tools depend on it
[license]
[refactor] fix exception inheritance, InvalidArgumentException classes under MVC/Request and MVC/Sender namespaces should inherit from base MVC/InvalidArgumentException
[build] exclude stubb classes from code coverage report
[clean] remove redundant use statement in InvalidStateException subclasses
[style] always prefix fully qualified class names with \ in use statements
[build] add --dev to composer target