#552 - Fix layout issues in PostSettingsController; cell reuse a big problem
#552 - Removed colon from placeholder text in post settings
#552 - Added disclosure indicators to publish post settings
#552 - Extracted cell identifier strings into constants
#552 - Renamed UITableViewActivityCell to WPTableViewActivityCell

UI is a reserved prefix - I’m sort of surprised we haven’t gotten rejected before for that.
Merge branch 'develop' into issue/552-post-settings

Conflicts:
	WordPress/Classes/CreateWPComBlogViewController.m
	WordPress/WordPress.xcodeproj/project.pbxproj
#552 - Removed extraneous subclass overrides
#552 - Fixed remaining layout issues with cell caching in Post Settings

Also renamed UITableViewActivityCell to WPTableViewActivityCell - something I had missed in a prior commit.
Merge pull request #713 from wordpress-mobile/issue/552-post-settings

Updated PostSettingsViewController layout & added disclosure indicators