Improved swift compatibility

• added nullability
• fixed some documentation

WatchOS support

Updated spec for watchOS support

Cleaned mapped objects

Fixed issues with relation ships when relation ship objects also have relation ship.
When you are mapping one object type from representation, you only get the array of those objects on first hierarchy level. Previously, you'd get every objects mapped in the process.

Fixed support for iOS 7-8

Modified code to support iOS 7 and 8

Added NSProgress

• Added NSProgress support

You can track progress using

[mapper.progress addObserver:self
                  forKeyPath:NSStringFromSelector(@selector(fractionCompleted))
                     options:NSKeyValueObservingOptionNew
                     context:NULL];

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context {
    if ([keyPath isEqualToString:NSStringFromSelector(@selector(fractionCompleted))] && [object isKindOfClass:[NSProgress class]]) {
        NSLog(@"Mapping progress = %f", [change[@"new"] doubleValue]);
    } else {
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}

It also supports cancellation

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
    [mapper mapFromRepresentation:JSON mapping:employeeMapping completion:^(NSArray *mappedObjects, NSError *error) {
        NSLog(@"Mapped objects %@ - Error %@", mappedObjects, error);
    }];
});

[mapper.progress cancel];

• Added a basic sample on view controller

Added default mapping blocks

• Added WANSCodingStore to the main header
• Added a way to register default mapping block for specific classes.
  For example, you can now add a default mapping block to turn strings to NSDate

id(^toDateMappingBlock)(id ) = ^id(id value) {
    if ([value isKindOfClass:[NSString class]]) {
        return [defaultDateFormatter dateFromString:value];
    }

    return value;
};

[mapper addDefaultMappingBlock:toDateMappingBlock
           forDestinationClass:[NSDate class]];

Added NSCoding store

• Exposed the store on WAMapper
• Added a new store: WANSCodingStore