Getters for UserCredentials member variables

[ajkannan]

Is there a reason that UserCredentials' member variables don't have public getters? It would be useful to have getters like in ServiceAccountCredentials.

[anthmgoogle]

No reason not to add them. These should be added.

[ajkannan]

Thanks for adding this! Is there a chance we can get an artifact pushed to maven with this change?

[pongad]

This is already included in v0.4.0. So I'm closing this