* Hollywood actress signs with Israeli soda-maker
* Activists condemn firm for factory in settlement
* Oxfam says her new role is "incompatible" with charity
By Noah Browning
JERUSALEM, Jan 30 (Reuters) - Actress Scarlett Johansson has quit her role as an ambassador for Oxfam, the charity said on Thursday, after she fell out with group for endorsing an Israeli firm operating in the ...