Verbose mode

[uatuko]

Currently, there's only one "info" level log during startup and error logs. This is OK for hosted environments where requests logs can be acquired by other means (e.g. proxy, LB) but it makes it difficult to have visibility into requests and other metrics when running locally.

Requirements

1. Add a verbose command-line arg to enable verbose mode.
2. If in verbose mode, log request/response info (something similar to apache access logs but very basic).