Add proper __repr__ and __str__ methods

[scardena]

As per the official python documentation, __repr__:

should look like a valid Python expression that could be used to recreate an object with the same value (given an appropriate environment). If this is not possible, a string of the form <...some useful description...> should be returned.

currently it's only returning the resource name.
We could have the str methods to return the names, but repr should be able to give a visual representation of the entire object