Based on v1.0.0 of the canonical data:

https://github.com/exercism/problem-specifications/tree/28a32203b96ebaecac6a6968831bd66718d8ba30/exercises/list-ops

Plus modifications that are being discussed in

https://github.com/exercism/problem-specifications/issues/826

The leading 'x' is kind of arbitrary. Especially now that we can set
topics on the repositories, we don't need a pattern to distinguish what
is a track or not.

The repository itself has already been renamed. GitHub redirects from
the old name to the new name, so we do not have to rush to fix links to
the old repository name, though we should update them for the sake of
clarity.

Since the exercise implementations are all in the exercises directory
we no longer need to ignore any non-exercise directories in the root
of the track.

 This will let us script changes to it with less noise in the diffs.

* 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

* dibs: I will implement exercise isogram

* isogram: add to track

* isogram: add to track

* improve Isogram implementation

* Isogram: adjust API to use instance methods

* Improve Isogram implementation

* Added list-ops exercise to the Java track
* Removed NetBeans settings from the project dir
* Added collect() operation and tests

* Remove deprecated problems key

    This should have no effect on the track since the problems key is
    long-deprecated, see https://github.com/exercism/x-api/pull/137 for
    confirmation.
* Reorder exercises array to match initial difficulty rankings
* Assign integer difficulties to all ranked exercises
* Adjust difficulty rating and position of grade-school

* dibs: I will implement exercise Clock

* Implemented clock exercise