Add quickselect algorithm. Quickselect is a selection algorithm to find the kth smallest element in an unordered list.

Currently the layer cannot be selected for low zoom levels.

Because the checking of current time is incapsulated in the thing that the test is testing, the test needs to do at least a copule tests that rely on the current time. The test was made to be robust to different times of day but there is a bug in the test where a certain time of day (the last several minutes before the hour i think) which causes the test to fail. we should fix that because it caus

Description
In the sorting algorithm page, the Heap Sort algorithm is missing. Add proper algorithms there.

The solution to be accepted
1.) In Heap_sort.js, Complete function selection(divs, height) with appropriate use for the functions provided.
2.) Used the same colors to fill up the division as used in bubble_sort.js.
3.) The visualizer is working properly for selection sorting.