[single-kzm_chapter] use kzm_checkUserHasChapter() method with less parameters.
[functions_books] Added more comments to around curl request. json service url and data to be posted are determined inside kzm_checkUserHasChapter() function.
Merge pull request #6 from MongeziNombewu/features/improvements-for-everegg

refactored kzm_checkUserHasChapter() method to use less parameters