I have recently ported my code to solidity 0.4.11 and have been noticing some warning errors upon declaring 'string' variables while declaring structs.
 

    struct person {
        string name;
        string physicalAddress;
    }

 
the warning I have been getting is:
```
Variable is declared as a storage pointer. Use an explicit "storage" keyword to silence the warning.
```
Suggestions on how to get rid of this warning? Also I am trying to understand the usage of storage and memory keywords - could anyone help explain the utility patterns of these keywords?