Fix behaviour of with_any_role with no args

User.with_any_role with no args should return all User instances having at least one role.
fix #363

For the generator specs to pass, I needed to add this: ActiveRecord::Base.establish_connection(:adapter => "sqlite3", :database => ":memory:")
Otherwise, generators specs are failing because of `ActiveRecord::ConnectionNotEstablished: No connection pool for ActiveRecord::Base` error.

I had to require explicitly active_view and active_controller gems for mongoid adapter to make generators specs pass for mongoid.
I changed also mongoid.yml to use clients instead of sessions
I tried to stop logging mongoid queries as it floods travis-ci but travis-ci displays logs from mongodb service directly and reaches 4MB logs limit. I don't know how to stop it

lib/rolify/adapters/active_record/role_adapter.rb

@@ -51,7 +51,7 @@ def scope(relation, conditions)
           query = relation.all
         end
         query = query.joins(:roles)
-        query = where(query, conditions)
+        query = where(query, conditions) if conditions
         query
       end
 

lib/rolify/finders.rb

@@ -19,6 +19,7 @@ def with_all_roles(*args)
     end
 
     def with_any_role(*args)
+      return self.adapter.scope(self, nil) if args.empty?
       users = []
       parse_args(args, users) do |users_to_add|
         users += users_to_add

spec/generators_helper.rb

@@ -14,8 +14,12 @@
 
 if ENV['ADAPTER'] == 'active_record'
   require 'active_record/railtie'
+  ActiveRecord::Base.establish_connection(:adapter => "sqlite3", :database => ":memory:")
+  ActiveRecord::Base.extend Rolify
 else
   require 'mongoid'
+  require 'action_view'
+  require 'action_controller'
 end
 
 module TestApp

spec/rolify/shared_examples/shared_examples_for_finders.rb

@@ -116,6 +116,7 @@
     describe ".with_any_role" do
       it { should respond_to(:with_any_role) }
 
+      it { subject.with_any_role().should eq(subject.joins(:roles).all)}
       it { subject.with_any_role("admin".send(param_method), :staff).should eq([ root ]) }
       it { subject.with_any_role("admin".send(param_method), :staff, { :name => "moderator".send(param_method), :resource => Group }).should eq([ root ]) }
       it { subject.with_any_role("admin".send(param_method), "moderator".send(param_method)).should eq([ root ]) }

spec/support/adapters/mongoid.yml

@@ -1,6 +1,7 @@
 test:
-  sessions:
+  clients:
     default:
+      logger: false
       database: godfather
       hosts:
         - localhost:27017