better tests for Taken constructor, removing Take#==

lib/arel/algebra/relations/operations/take.rb

@@ -7,13 +7,6 @@ def initialize relation, taken
       @taken = taken
     end
 
-    def == other
-      super ||
-        Take === other &&
-        relation == other.relation &&
-        taken == other.taken
-    end
-
     def engine
       engine   = relation.engine
 

spec/algebra/unit/relations/relation_spec.rb

@@ -134,7 +134,9 @@ module Arel
 
       describe '#take' do
         it "manufactures a take relation" do
-          @relation.take(5).should == Take.new(@relation, 5)
+          take = @relation.take(5)
+          take.relation.should == @relation
+          take.taken.should == 5
         end
 
         describe 'when given a blank number of items' do