Add a way to remove callbacks
Remove StatefulInterface from type hint

To be fully compliant with the new property access strategy
Improve exception message
Merge pull request #45 from winzou/exception

Improve exception message
Merge pull request #40 from winzou/feature/config

[Bundle] Add a way to remove callbacks via configuration
Throw an exception when object is invalid

Fix #41
Added tests on invalid object exception
Merge branch 'fix/object'
Updated composer.json

* Used ~x.y instead of complex version spec
* Added contributors
Removed pmd and pdepend as a dev dependency
fixed multigraph ArrayLoader issue (set graph to StateMachine)
Removed ->setLazy() call when not available (sf < 2.3)
Merge pull request #50 from jpottier/master

fixed multigraph ArrayLoader issue (set graph to StateMachine)
Merge pull request #39 from winzou/fix/interface

Remove StatefulInterface from type hint
Add a soft mode to the cascade Callback