Removed division from folder
Added implementation of Time
Implemented PowerOutage

The algorithms is correct but system test fail because it is too slow. I
had the impression that brute force was enough but I was wrong. Need to
find a quicker solution.
PowerOutage quick implementation that pass system tests!

The key thing was that the graph does not contains loops. This simplify
the problem a lot and allows a quick implementation with a simple tree
traversal. Very cool