Don't show alerts when saving notification settings failed

git-svn-id: http://ios.svn.wordpress.org/trunk@4071 7d847f7c-ffe1-4a24-85be-b788d016d96a
Bump version to 3.5

git-svn-id: http://ios.svn.wordpress.org/trunk@4072 7d847f7c-ffe1-4a24-85be-b788d016d96a