added interpolation and startDelay for animations

lib/ios/RNNModalAnimation.m

 	[_screenTransition.topBar setupInitialTransitionForView:toViewController.navigationController.navigationBar];
 	
 	
-	[UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
+	[UIView animateWithDuration:[self transitionDuration:transitionContext] delay:self.screenTransition.content.startDelay options:self.screenTransition.content.interpolation animations:^{
 		[_screenTransition.content completeTransitionForView:toViewController.view];
 		[_screenTransition.topBar completeTransitionForView:toViewController.navigationController.navigationBar];
 	} completion:^(BOOL finished) {

lib/ios/RNNPushAnimation.m

 }
 
 - (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext {
-	return 0.5;
+	return self.screenTransition.content.duration;
 }
 
 - (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
 	
 	[self.screenTransition.content setupInitialTransitionForView:toViewController.view];
 	[self.screenTransition.topBar setupInitialTransitionForView:toViewController.navigationController.navigationBar];
+	[self.screenTransition.bottomTabs setupInitialTransitionForView:toViewController.tabBarController.tabBar];
 	
 	
-	[UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
+	[UIView animateWithDuration:[self transitionDuration:transitionContext] delay:self.screenTransition.content.startDelay options:self.screenTransition.content.interpolation animations:^{
 		[self.screenTransition.content completeTransitionForView:toViewController.view];
 		[self.screenTransition.topBar completeTransitionForView:toViewController.navigationController.navigationBar];
+		[self.screenTransition.bottomTabs completeTransitionForView:toViewController.tabBarController.tabBar];
 	} completion:^(BOOL finished) {
 		[transitionContext completeTransition:![transitionContext transitionWasCancelled]];
 	}];

lib/ios/RNNTransitionStateHolder.h

 @property (nonatomic) double endY;
 @property (nonatomic) double startX;
 @property (nonatomic) double endX;
+@property (nonatomic) UIViewAnimationOptions interpolation;
 
 - (instancetype)initWithTransition:(NSDictionary*)transition;
 

lib/ios/RNNTransitionStateHolder.m

 	self.fromId = [transition objectForKey:@"fromId"];
 	self.toId = [transition objectForKey:@"toId"];
 	self.isSharedElementTransition = [[transition objectForKey:@"type"] isEqualToString:@"sharedElement"];
+	self.interpolation = [self animationOptionsFromString:transition[@"interpolation"]];
+	
 	
 	return self;
 }
 
+- (UIViewAnimationOptions)animationOptionsFromString:(NSString*)interpolationString {
+	if ([interpolationString isEqualToString:@"accelerate"]) {
+		return UIViewAnimationOptionCurveEaseIn;
+	} else if ([interpolationString isEqualToString:@"decelerate"]) {
+		return UIViewAnimationOptionCurveEaseOut;
+	}
+	
+	return UIViewAnimationOptionCurveEaseInOut;
+}
+
 - (void)setupInitialTransitionForView:(UIView*)view {
 	_initialFrame = view.frame;
 	view.alpha = self.startAlpha;