Fixes #1528. Always uses jetpack_client_id instead of recycling blogID for .org blogs. 
Jetpack 1.8.2 or better is required for stats. 
Settings screen does not show credentails when Jetpack needs to be installed or upgraded. 



git-svn-id: http://ios.svn.wordpress.org/trunk@3778 7d847f7c-ffe1-4a24-85be-b788d016d96a