[COOK-2450] Add ability to define service groups through data bags.
Add hostname normalization to lowercase.
Removed extra "!("
Merge pull request #144 from behrendsj/cook-2558

Removed extra "!("
Merge pull request #138 from scottso/normalize_hostnames

[COOK-2543] Add hostname normalization to lowercase.
Merge pull request #130 from scottso/add_servicegroup_databags

[COOK-2450] Add ability to define service groups through data bags.
Fix missing all wildcard. Fix intersect with node.run_list.roles instead of node.roles.
Merge branch 'COOK-2541'