* dibs : I will implement exercise bookstore
* bookstore : add to track
* bookstore : add to track
update config.json
* Update config.json : added orc-numbers
* add missing test from the canonical spec and delete the remaning test
* using camelCase instead of snake_case for tests methods
* adding @Ignore annotation
* using List instead of ArrayList
* using instance methods instead of class method
* delete useless stuff
* modify magic numbers
* update CostPerGroup method
* update class name and files name to Bookstore from Bookstore + using camelCase for methods
* pass the integers directly to the Arrays.asList() methods
* adding brackets
* fix constant variable
* using static for constants
Stuart Kent
Thibault LADENT