Add quote_ident method for rails 2.3.{3,4} compat.

See http://github.com/mneumann/postgres-pr/issues#issue/1 and
http://github.com/rails/rails/commit/60601234708b34c81dcd6a58a0cad79a7520ce10

Submitted-by: http://github.com/rahim

Author: mneumann

lib/postgres-pr/postgres-compat.rb

@@ -51,6 +51,10 @@ def notice_processor=(np)
     @conn.notice_processor = np
   end
 
+  def self.quote_ident(name)
+    %("#{name}")
+  end
+
 end
 
 class PGresult

lib/postgres-pr/version.rb

@@ -1,3 +1,3 @@
 module PostgresPR
-  Version = "0.6.2"
+  Version = "0.6.3"
 end