remove all roles for a resource

[Genkilabs]

Given a User with a collection of unknown roles for a known resource, I would like to remove them all on some condition.
Of course I could do something like

	rolify :before_add => :remove_old_roles
	def remove_old_roles(role)
		roles.where(:resource => role.resource).collect(&:names).each do |old_role_name|
			remove_role old_role_name, role.resource
		end if do_refresh
	end

But what would be superior would be to allow some kind of blank/any syntax such as:
current_user.remove_role nil, resource
This currently does not work because the remove_role method casts the param role_name to a string before handing it off to the adapter.

One less-intrusive solution I imagined might be to change the included adapters as such:

  def remove(relation, role_name, resource = nil)
    cond = {}
    cond[:name] = role_name unless role_name.blank?
    cond[:resource_type] = (resource.is_a?(Class) ? resource.to_s : resource.class.name) if resource

(For reference, I'm thinking in here: https://github.com/RolifyCommunity/rolify/blob/master/lib/rolify/adapters/active_record/role_adapter.rb#L53)

I took a crack at doing this myself and would be happy to make a PR, but I can't seem to get the gem to build...? LoadError: cannot load such file -- rolify/adapters/active_record/resource_adapter.rb <_<

Anyways, does this seem like a good change, or is there a better remove_all_roles(resource) solution I am unaware of?

If no one wants to make it, I can, but is there a build procedure or contribution doc I should follow?

[Genkilabs]

This is the gist of what I'm thinking Genkilabs@eb96834