moved sql related code to its own engine area

Conflicts:

	lib/arel/engine.rb
	lib/arel/extensions/object.rb
	lib/arel/predicates.rb
	lib/arel/primitives/attribute.rb
	lib/arel/primitives/expression.rb
	lib/arel/primitives/value.rb
	lib/arel/relations/operations/join.rb
	lib/arel/relations/relation.rb
	lib/arel/relations/utilities/externalization.rb
	lib/arel/relations/utilities/nil.rb
	lib/arel/relations/writes/delete.rb
	lib/arel/relations/writes/insert.rb
	lib/arel/relations/writes/update.rb
	spec/arel/unit/relations/skip_spec.rb
	spec/arel/unit/relations/take_spec.rb
	spec/spec_helper.rb

1 files changed, 2 insertions, 2 deletions

diff --git a/spec/arel/unit/relations/table_spec.rb b/spec/arel/unit/relations/table_spec.rb
index 08486c7b6c..211e6921f8 100644
--- a/spec/arel/unit/relations/table_spec.rb
+++ b/spec/arel/unit/relations/table_spec.rb
@@ -87,12 +87,12 @@ module Arel
 
     describe '#engine' do
       it "defaults to global engine" do
-        Table.engine = engine = Engine.new
+        Table.engine = engine = Sql::Engine.new
         Table.new(:users).engine.should == engine
       end
 
       it "can be specified" do
-        Table.new(:users, engine = Engine.new).engine.should == engine
+        Table.new(:users, engine = Sql::Engine.new).engine.should == engine
       end
     end
   end