Adding 'bind_ip' as optional parameter

Adding 'bind_ip' parameter and bumping version to '0.12'. As discussed at #18 'bind_ip' should not be managed by default, doing it only when 'bind_ip' parameter is explicitly set.

This pull request includes previous Mike Dolphs pull request  User@SHA ref: fooforge/chef-cookbooks@291c5abe8e0394086fdce7b8838cff0ad6161360 commit.