Add enable\disable\force password change directory methods

[chudamax]

Add some methods to be able to enable\disable users or force to change the password. Not sure, is it a right class or I should use User?

[alejcas]

Not sure, is it a right class or I should use User?

It's ok although this methods should also be available on the User class

[alejcas]

I've added a couple of comments to your code. They apply for all the methods.

Thanks!