Version 0.4.0
Support running testacular on a custom hostname

Add an optional 'host' parameter to the configuration
Usecase: application requires a virtual host naming pattern.
For testing, map the hostname on /etc/hosts and
make testacular run on that hostname and launch
the test browsers on that hostname.
Fix launcher tests; Add test of custom hostname

OK I got caught not running the tests by travis.
I did find the Contributing.md document on the master branch
and it passes now.