Kata's should be graded

[shakurah]

Instead of just showing you passed katas should be graded on
-How well your code performed
-How well written it is(use of functions and objects)

[hobovsky]

Measured of performance is not planned for now. You can see #959 and linked issues for some details why.

Code style would be quite difficult to be graded automatically.

[shakurah]

Ohk thanks