Added sqlite-simple

I tried hard to test this addition locally, however both of my attempts to build Stackage failed.  The latter attempt failed on https://github.com/fpco/stackage/issues/129#issuecomment-27125565.  This is not related to sqlite-simple, the error happens regardless of my changes.

As postgresql-simple is already on the ["recommended libraries"](https://www.fpcomplete.com/school/ide-tutorials/recommended-libraries) list, I think it'd make sense to have sqlite-simple and mysql-simple on there too.  This one adds my sqlite-simple.

The test error (https://github.com/IreneKnapp/direct-sqlite/issues/32) that's on "known issues" list in Stackage should also be fixed in direct-sqlite-2.3.7 which was released yesterday.