* BAEL-756 code for kotlin null-safety article
* BAEL-756 fix typo
* BAEL-756 increment version of Kotlin
* BAEL-756 remove duplicate form pom
* BAEL-756 add also and run example
* Char array to string and string to char array test cases added
* Minor code renames
* Added groupingBy collector unit tests
* Added test case for int summary calculation on grouped results
* Added the grouping by classes to the main source path
* Reverting char array to string test class
* Reverting char array to string test class
* Reverting char array to string test class
* Reverting char array to string test class
* Unit test class for Kotlin when block + required types
* Minor changes to kotlin when block tests
* Minor change
* Minor change
