Support default initializer and rename method to be less ambiguous.

Mobile Buy SDK/Mobile Buy SDK/Models/BUYModelManager.h

@@ -40,15 +40,13 @@
  */
 @property (nonatomic, strong, readonly) NSManagedObjectModel *model;
 
-- (instancetype)init NS_UNAVAILABLE;
-
 /**
  *
  *  @param model The Core Data managed object model for your given model. Should be the Buy model.
  *
  *  @return A new model manager object.
  */
-- (instancetype)initWithModel:(NSManagedObjectModel *)model NS_DESIGNATED_INITIALIZER;
+- (instancetype)initWithManagedObjectModel:(NSManagedObjectModel *)model NS_DESIGNATED_INITIALIZER;
 
 /**
  * Convenience initializer. Instantiates a model using the -mergedModelFromBundles: method and the Buy.framework as the bundle.

Mobile Buy SDK/Mobile Buy SDK/Models/BUYModelManager.m

@@ -64,7 +64,12 @@ NSString * const BUYPublicationsDateFormat = @"yyyy-MM-dd'T'HH:mm:ssZ";
 	});
 }
 
-- (instancetype)initWithModel:(NSManagedObjectModel *)model
+- (instancetype)init
+{
+    return [self initWithManagedObjectModel:[NSManagedObjectModel mergedModelFromBundles:@[[NSBundle bundleForClass:[self class]]]]];
+}
+
+- (instancetype)initWithManagedObjectModel:(NSManagedObjectModel *)model
 {
 	self = [super init];
 	if (self) {
@@ -75,7 +80,7 @@ NSString * const BUYPublicationsDateFormat = @"yyyy-MM-dd'T'HH:mm:ssZ";
 
 + (instancetype)modelManager
 {
-	return [[self alloc] initWithModel:[NSManagedObjectModel mergedModelFromBundles:@[[NSBundle bundleForClass:[BUYObject class]]]]];
+	return [[self alloc] init];
 }
 
 - (NSEntityDescription *)buy_entityWithName:(NSString *)entityName