Move information to output verbosely from 'prop' into 'util'

* Remove all of 'verbose' from 'prop' module
* Add procedures to output 'verbose' into 'PrettyPrinter' in 'util' module
Change version of distribute from 0.6.34 to 0.7.3
Modify `.travis.yaml` to add `sudo` command to the line to call `pip`