Remove duplicated countWithPredicate

Removed countWithPredicate because is duplicated of:

```swift
    /**
    Count all the entity matching the input predicate
    
    :param: context the NSManagedObjectContext. Default value is SuperCoreDataStack.defaultStack.managedObjectContext
    
    :param: predicate
    
    :param: error
    
    :returns: Int of total result set count.
    */
    class func count(context: NSManagedObjectContext = SuperCoreDataStack.defaultStack.managedObjectContext!, predicate : NSPredicate?, error: NSErrorPointer) -> Int 
```