Add notebook & functions for adversarial domain adaptation

[tliu68]

Reference issue

Fixes issues #79, #428, #443, #446

Type of change

Feature request

What does this implement/fix?

Adds a jupyter notebook and associated function file that demonstrate the usage and performance of several algorithms to alleviate adversarial domain adaptation.

Additional information

work with @ykobaya9 @williamrxu

[tliu68]

@jdey4 could you please take a look?