Generator should have --verbose mode

@nikita-leonov: As a user that runs generator with --verbose flag, I should see an output from a generator with a list of a files processed with each of important steps of parsing for each of the steps. Something like following:
File: EPAppDelegate.m
Operations:
Exclude one-line comments from parsing [v]
Exclude multi-line comments from parsing [v]
Parse list of properties [v]
Parse list of ivars [v]
Parse list of methods [v]