adding a unsuccessful linesearch to the "convergence-conditions"? #15

It would be helpful if one could add the option of terminating the optimization procedure in case a linesearch is not able to find a new set of variables that satisfy the Wolfe conditions.
Do you think that this could be included?
This could be done by giving the information about the success of the linesearch into the finalize! function such that the user can use it to terminate the optimization in that case.
Best wishes,
Erik