challenge 04: ranges
task 03: add tests and solution
task 03: fix tests
Remove unnecessary testing function, make checking not dependent.
Now it can work with ClojureScript
challenge 04: improve README and tests
Merge pull request #13 from NikolayGenov/fix-task-03

Remove unnecessary testing function, modify checking for a value.
challenges 04: clarify conditions
challenge 04: tweak
challenge 04: tweak
challenge 04: fix example