update Debian packaging for new version

bump version to 0.3.7
add ruby-patron as build-dep
add ruby-json as a build-dep
specify native package
Bypass nag page newer iDRAC7 firmwares present

On iDRAC7 somewhere around firmware version 1.30.30 (Build 43) a nag
page was introduced to encourage the user to change the default
credentials. Still warn the user, but bypass the nag page.

Add the warn logging method to display output even if verbose is not
enabled.
version 0.3.8
Merge pull request #7 from nferch/bugfix/new-fw

Bypass iDRAC7 nag, Debianisation updates, version bump