Bugfixes and new features

• New: it is now possible to set a reference to the path of a created Content/Location. This allow to use it subsequently when assigning a role with subtree limitation
• Fix: the documentation describing usage of the 'match' keyword for updating/deleting contents and locations was incorrect
• Fix: the documentation describing usage of the 'limitations' keyword for managing roles was incorrect
• Fix: Role creation would not work when using eZPlatform
• BC BREAK: the 'limitation' keyword used to describe role assignments has been replaced by 'limitations' (it was documented using the plural form before)