Pymapd

sqlalchemy` was accidentally removed from the list of dependencies when installing from pypi / directly with setup.py.

Also fixes a minor issue in `test_loaders.py`.

- Update Thrift bindings to reflect service name change from `mapd` to `omnisci`
- Rework to support Arrow 0.15 / 0.16
- Update to use RBC 0.2.2
- Add experimental SAML authentication support

This release is a cleanup of the dependencies to require pandas 1.0+, so that we can lower the surface area of potential errors/environments solved for. Other PRs were to the development environment files and should have no impact on end-users.

_Relevant PRs_:

Pin Jenkins to 5.1 temporarily (299)
Update pandas to 1.0 (298)
Change mapd reference to omnisci reference (300)

- Adds ability to call `conn.get_dashboard()` to return a single dashboard definition 287
- Modifies behavior to run `register_runtime_udfs()` as part of cursor init instead of `connect()` 288

This release updates the Thrift bindings in preparation for the 5.0 release.