Made loadDefaultConfiguration a public method

When loadDefaultConfiguration is a public method it can be called separately from within awakeFromNib (or another place). This is needed when using the Storyboard to set up the UIViewControllers instead of manually allocating and initializing them.

**Example**

```objective-c
-(void)awakeFromNib
{
	// Set up front and rear view:
	UIViewController *frontVC = [self.storyboard instantiateViewControllerWithIdentifier:@"VCHome"];
	UIViewController *rearVC = [self.storyboard instantiateViewControllerWithIdentifier:@"VCSideMenu"];

	UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:frontVC];

	self.frontViewController = nav;
	self.rearViewController = rearVC;
	[self loadDefaultConfiguration];

	self.delegate = self;
}
```