Changed Launch Image as per Apple design guidelines. Added icons for iOS6.  Fixed some compiler warnings
Fixed bug in DataColumnView where layoutSubviews was not calling super
Working classes to save data
updated some icons and screens
Updated UserVdot data structure to contain a 'isDefault' (which probably shouldn't be in this structure but is for now).  Also updated a description method
Changed type of VdotDataStore.currentVdot from int to NSInteger
Updated SavedUserVdotStore to be a singleton, fetchAll now returns an NSArray of UserVdots instead of a NSDictionary of <UUID, UserVdot>, changed delete method to take a UUID instead of a UserVdot*
Updated AppDelegate so if there's a 'Default' UserVdot, we set it the VdotDataStore.currentVdot to that value and make the 'Intervals' tab the first tab that appears on the screen
Added a hack-y method for storing user vdots.  This is definitely not complete