grade-school: remove potential test pollution [Fix #371]

Wordy extract setup

Make raindrops use instance method

WordProblemSolver no longer instantiates in each test

Fixes issue #352

* 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

Make hamming use instance methods

* 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

Fixes issue #346

#379 flatten-array: add @Ignore to tests

Pangrams is currently the third exercise in the new ordering therefore
it should have a starter implementation.

* make object-orientated
* add starter implementation
* rename class to PangramChecker

atbash-cipher: Update to canonical data

rna-transcription: make object-based and add starter implementation

Add decode test case with description - decode all the letters

Add test cases - 'does not detect a word as its own anagram' and
'anagrams must use all letters exactly once'

69% savings!

allergies: Update to canonical data

Test case - allergic to eggs in addition to other stuff is incomplete.
Add checks for shellfish and strawberries.

Remove redundant .keep file from wordcount fixes #330

acronym: update tests according to canonical data

beer-song: add more line breaks [Fix #317]

Complete started implementation added as this is currently the second
exercise in the new ordering.

See issue #178

See issue #177

Add test case with description 'non-acronym all caps word'

beer-song: split tests per assertion [Fix #318]

pangram: test names include expected outcome[Fix #313]

pangram: implement missing test [Fix #314]

* Simplify construction logic for palindrome products

Fixes issue #283

* Refactor palindrome test comparator into a named function

Change order and names of anagram tests

* 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

change: add to track

hamming: make test names consistent [Fix #304]