Added advice to error message - TODO: Better ask user if the box should be build
Fixed test_environment_default_to_currentdir failing when VEEWEE_DIR is set.
Removed duplicate install task in Rakefile. Cutes the instal time into half.
Fixes #580 #581 (Fixed TCP port guessing)
Merge pull request #582 from Drachenfels-GmbH/master

Fixes #580, #581