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* Add optional `session` argument to `RoboBrowser::__init__`
* Add optional `timeout` and `allow_redirects` options to `RoboBrowser::__init__`
* Allow `RoboBrowser::open`, `RoboBrowser::follow_link`, and `RoboBrowser::submit_form` to accept optional keyword arguments to requests (`timeout`, `verify`, etc.)
* *Backwards-incompatible*: Remove `auth`, `headers`, and `verify` arguments `from RoboBrowser::__init__`; session configuration should instead be passed in `session`
* *Backwards-incompatible*: Restrict `RoboBrowser::follow_link` to `link` argument; text strings and BeautifulSoup arguments no longer accepted