chriscdn/RHManagedObject — pull request #2 by mattleff (2012-12-07 00:45:19+00:00)
Title: Add static to find an entity by predicate or create new entity

Example:

```objective-c
Employee *employee = [Employee newOrExistingEntityWithPredicate:[NSPredicate predicateWithFormat:@"employeeID=%i", 12345]];
[employee setFirstName:@"John"];
//etc...
```