Fix bug when creating contact.
The contact is created asynchronously so we cannot try to get it immediatly.
As a consequence the method IRoster.createContact now return a boolean.
package net.java.otr4j.crypto;
import net.java.otr4j.OtrException;
@SuppressWarnings("serial")
public class OtrCryptoException extends OtrException {
public OtrCryptoException(Exception e) {
super(e);
}
}