Remove initializers from the NICollectionViewModeling protocol. (#707)

The initializers are not really required on the NICollectionViewModeling
protocol. Instead of requiring all clients of the NICollectionViewModeling
protocol to implement them, let's remove them.

NOTE: This has no change to the concrete implementations of the model
classes, it just updates the protocols required for other alternative
model objects.

src/collections/src/NICollectionViewModel.h

@@ -43,14 +43,6 @@
  */
 @protocol NICollectionViewModeling <NIActionsDataSource, UICollectionViewDataSource, UICollectionViewDataSourcePrefetching>
 
-#pragma mark Creating Collection View Models
-
-// Designated initializer.
-- (id)initWithDelegate:(id<NICollectionViewModelDelegate>)delegate;
-- (id)initWithListArray:(NSArray *)listArray delegate:(id<NICollectionViewModelDelegate>)delegate;
-// Each NSString in the array starts a new section. Any other object is a new row (with exception of certain model-specific objects).
-- (id)initWithSectionedArray:(NSArray *)sectionedArray delegate:(id<NICollectionViewModelDelegate>)delegate;
-
 #pragma mark Accessing Objects
 
 - (NSIndexPath *)indexPathForObject:(id)object;
@@ -77,6 +69,11 @@
 
 - (id)initWithDelegate:(id<NICollectionViewModelDelegate>)delegate NS_DESIGNATED_INITIALIZER;
 
+- (id)initWithListArray:(NSArray *)listArray delegate:(id<NICollectionViewModelDelegate>)delegate;
+
+// Each NSString in the array starts a new section. Any other object is a new row (with exception of certain model-specific objects).
+- (id)initWithSectionedArray:(NSArray *)sectionedArray delegate:(id<NICollectionViewModelDelegate>)delegate;
+
 // Redeclaring for property autosynthesis.
 @property (nonatomic, weak) id<NICollectionViewModelDelegate> delegate;