ILSGateway, EWSGhana changes

http://manage.dimagi.com/default.asp?148847#837455
http://manage.dimagi.com/default.asp?134684#831319
http://manage.dimagi.com/default.asp?148852#831253
changes in checkpoint according to discussion in google group.  
@czue @twymer
@dannyroberts do we care about using `ObjectProperty` versus `SchemaProperty`? Saw they were basically just aliases.