Restructured files for better readability
Removed unused image file
Extracted library JS files into separate folder. Cosmetic changes
Improved readability of initializations in presenter.js
Cosmetic changes in adding item code of presenter; incorporated the callback functions into the body of their main functions
Restructured and made cosmetic changed to ItemToBuy saving code in presenter.js
Restructured the saving functionality for cleaner separation of concerns. See TODO, which have to be implemented before the code will work
Unified the clearing of items list in presenter.js with the rest of the code
Moved serverAlert to helper.js, what is more logical
Improved the structure and readability of helper.js