Add new corner test cases to 28 (For Loop) suite.
Add new corner test cases to 28 (For Loop) suite.

Reason:
For guys which don't want to use `MyDate.nextDay` extension

Added:
* Iterating over the range with new year
* Iteration over the range with 29 of February.

zyallday/kotlin-koans,JetBrains/workshop-jb,trmollet/tuto_kotlin,trmollet/tuto_kotlin,Riccorl/kotlin-koans,JetBrains/workshop-jb,enchf/kotlin-koans,hughandrewarch/kotlin-koans,Carighan/kotlin-koans,zyallday/kotlin-koans,hughandrewarch/kotlin-koans,Kotlin/kotlin-koans,TheCoinTosser/Kotlin-Koans---Solutions,TheCoinTosser/Kotlin-Koans---Solutions,Riccorl/kotlin-koans,enchf/kotlin-koans,Carighan/kotlin-koans,Kotlin/kotlin-koans,wickedwukong/kotlin-koans,wickedwukong/kotlin-koans