improvements to --verbose mode

[dbieber]

This ticket is for improvements to --verbose mode, such as making debug information (like filepath, line no, etc) only show up in verbose mode.

[ostrokach]

It would be great if -v or --verbose changed the Python logging level.

For example, -v for logging.WARNING, -vv for logging.INFO, -vvv for logging.DEBUG.

[dbieber]

In the upcoming release, the debug information (filepath, line no, etc) no longer shows up when not in verbose mode.

However, it also does not show up in verbose mode.
I'll leave this ticket open for adding additional information when in verbose mode.