Add ksort to ArrayObject util

[mikeymike]

Adds ksort functionality to the ArrayObject

[codecov-io]

Codecov Report

Merging #199 (1cc74db) into master (7b34e68) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #199      +/-   ##
============================================
+ Coverage     91.77%   91.79%   +0.01%     
- Complexity      692      693       +1     
============================================
  Files           101      101              
  Lines          2116     2120       +4     
============================================
+ Hits           1942     1946       +4     
  Misses          174      174              

Impacted Files	Coverage Δ	Complexity Δ
src/Result/FunctionRequirementsFailure.php	100.00% <ø> (ø)	3.00 <0.00> (ø)
src/ExerciseRunner/CgiRunner.php	90.74% <100.00%> (ø)	25.00 <5.00> (ø)
src/ExerciseRunner/CliRunner.php	100.00% <100.00%> (ø)	20.00 <4.00> (ø)
src/Utils/ArrayObject.php	100.00% <100.00%> (ø)	22.00 <1.00> (+1.00)

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