Range intersection

Purpose: Range/interval intersection

A and B two ranges of closed intervals written
as vectors [lowerbound1 upperbound1 lowerbound2 upperbound2]
or as matrix
[lowerbound1, lowerbound2, lowerboundn;
upperbound1, upperbound2, upperboundn]
A and B have to be sorted in ascending order

out is the mathematical intersection A n B

EXAMPLE USAGE:
>> out=range_intersection([1 3 5 9],[2 9])
out = [2 3 5 9]
>> out=range_intersection([40 44 55 58], [42 49 50 52])
out = [42 44]