Minor SFImageButton adjustments.
Remove errant semicolons.
Remove object persist references in viewcontrollers, etc.
remove setPersistStyle, replace with setProminent/isProminent, referring to style rather than object persistence. Remove use of setPersistStyle in SFDataTableDataSource since celldatatransformers should already be handling that on their own.
Fix refresh of tablviews and settingsfollowing/unfollowing objects. This closes #355 and #356.