API Proposal for Logging

By default writing to a logger would not go to STDOUT without a handler. One solution to this is to attach a handler when verbose is an integer and use the logger if it is passed in.

```py
# Do not log
func(verbose=0)

# will create a stream handler to stdout
func(verbose=1)

# will write to the logger passed in
func(verbose=logger)
```

Edit: See also #78.