adjust/AEPriceMatrix — pull request #2 by wellle (2014-03-04 18:00:43+00:00)
Title: Implement [AEPriceMatrix convert: from: to:]

Example usage:
```objc
NSNumber *converted = [AEPriceMatrix convert:@0.99 from:@"USD" to:@"EUR"];
NSLog(@"converted to %@", converted);
```
Output:
```
converted to 0.89
```