Handle the verbose flag earlier

[diego-plan9]

As part of #22 , in #54 a println! was introduced in order to display errors during parsing the config file. This was due to logging being initialized earlier than parsing the config file - which means the logger is not available yet at that point (and its seems the logger cannot be updated after its creation).

It would be good to revise the ordering and the handling of verbose flag, in order to emit a log entry instead of a plain print.