cuke4duke-maven-plugin is does not use username/password for proxy connection

[imod]

If maven is configured to use a proxy, the cuke4duke maven plugin only uses protocol/host/port combination while triggering the gem installation.
The plugin should add the username/password to the http-proxy argument too - otherwise the conenction to the outherworld fails!

e.g. if username/password is defined, it should not define the http-proxy like this:
--http-proxy http://myproxy.com:8080
but like this:
--http-proxy http://theuser:secret@myproxy.com:8080

[imod]

I send a pull request to fix this issue: #113

[joelbyrnes]

This is also an issue for my team. We'd appreciate the fix being pulled in. Thanks!