Fix up role_requires logic to make automatically adding implicit roles actually work. [1/1]

As the description says.

 crowbar_framework/app/models/node_role.rb          |    6 ++---
 crowbar_framework/app/models/role.rb               |   15 ++++++-----
 .../migrate/20120731225511_create_role_requires.rb |   26 ++++++++++++++++++++
 .../migrate/20120731320000_create_role_requires.rb |   26 --------------------
 4 files changed, 38 insertions(+), 35 deletions(-)

Crowbar-Pull-ID: 6b623130e3c620b214baad504771b72ddf86cbb8

Crowbar-Release: development