Add "sbase" shortcuts for "seleniumbase"

Author: mdmintz

sbase/__init__.py

@@ -1,6 +1,8 @@
+from seleniumbase import __version__  # noqa
 from seleniumbase import BaseCase  # noqa
 from seleniumbase import decorators  # noqa
 from seleniumbase import Driver  # noqa
+from seleniumbase import DriverContext  # noqa
 from seleniumbase import encryption  # noqa
 from seleniumbase import get_driver  # noqa
 from seleniumbase import js_utils  # noqa