Fixed error when removing an index from a table name values, which is a reserved word, with test.

Signed-off-by: José Valim <jose.valim@gmail.com>

activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb

@@ -365,7 +365,7 @@ module ActiveRecord
       end
 
       def remove_index!(table_name, index_name) #:nodoc:
-        execute "DROP INDEX #{quote_column_name(index_name)} ON #{table_name}"
+        execute "DROP INDEX #{quote_column_name(index_name)} ON #{quote_table_name(table_name)}"
       end
 
       # Rename an index.

activerecord/test/cases/migration_test.rb

@@ -1621,6 +1621,22 @@ if ActiveRecord::Base.connection.supports_migrations?
     end
   end
 
+  class ReservedWordsMigrationTest < ActiveRecord::TestCase
+    def test_drop_index_from_table_named_values
+      connection = Person.connection
+      connection.create_table :values, :force => true do |t|
+        t.integer :value
+      end
+      connection.add_index :values, :value
+
+      # Just remove the index, it should not raise an exception
+      connection.remove_index :values, :column => :value
+
+      connection.drop_table :values rescue nil
+    end
+  end
+
+
   class ChangeTableMigrationsTest < ActiveRecord::TestCase
     def setup
       @connection = Person.connection