The MSSyncContextDataSource protocol has a typo

[atheken]

The 2.0-beta MSSyncContextDataSource includes an optional method signature for

"-(NSUInteger) systemPropetiesForTable:(NSString *)table;"

Should be "Properties":

/// Returns the MSSystemProperties that should be stored locally (example: __createdAt, __updatedAt)
/// If not implemented, the default of __version will be asked for from the server
-(NSUInteger) systemPropetiesForTable:(NSString *)table;