Make it more easy to pass more arguments to get_connection through BaseImporter and VerticaBatch.
Update README.
Update docstrings.
Merge pull request #9 from brocaar/master

	 Make it more easy to pass more arguments to get_connection through BaseImporter and VerticaBatch.
Change _ to - in argument names. Tidy up a bit.
Use values from --config-path as defaults for argparse.
Update docs.
More documentation. Remove password arguments from argparse.
Update migrate script to make it work with new arguments.
Only decode if we are dealing with a str instance.
Make sure we always reach the last steps.
Update docs.
Make --config-path mandatory.
Bump version.
Merge pull request #10 from brocaar/improve_migrate_tool

Improve migrate tool
Move documentation to RTD.
Merge pull request #11 from brocaar/improve_migrate_tool

Move documentation to RTD.
Mock out pyodbc.
Merge pull request #12 from brocaar/improve_migrate_tool

Mock out pyodbc.
Implement rollback method.