Create test data generators

[ErikSchierboom]

The canonical data of the various exercises regularly receives updates. Some of our exercises will be using outdated or incomplete data. We should try to fix this by writing test generators, support for which is added in #228.

[ErikSchierboom]

[robkeim] Updated as of Aug 20 2017 with exercises that don't have cannonical data

• acronym
• all-your-base
• allergies
• alphametics
• anagram
• atbash-cipher
• beer-song
• binary-search
• bob
• book-store
• bowling
• bracket-push
• circular-buffer
• clock
• connect
• collatz-conjecture
• crypto-square
• custom-set
• diamond
• difference-of-squares
• dominoes
• etl
• flatten-array
• food-chain
• gigasecond
• grains
• house
• hamming
• hello-world
• isogram
• kindergarten-garden
• largest-series-product
• leap
• list-ops
• luhn
• meetup
• minesweeper
• nth-prime
• nucleotide-count
• ocr-numbers
• pangram
• pascals-triangle
• perfect-numbers
• phone-number
• pig-latin
• poker
• prime-factors
• queen-attack
• rail-fence-cipher
• raindrops
• rna-transcription
• robot-name
• robot-simulator
• roman-numerals
• run-length-encoding
• saddle-points
• say
• scrabble-score
• secret-handshake
• sieve
• space-age
• sum-of-multiples
• tournament
• transpose
• triangle
• two-bucket
• two-fer
• word-count
• wordy

No canonical data:

• accumulate
• binary-search-tree
• grade-school
• linked-list
• matrix
• palindrome-products
• protein-translation
• proverb
• pythagorean-triplet
• scale-generator
• series
• simple-cipher
• simple-linked-list
• strain
• twelve-days

[ErikSchierboom]

If someone is interested in writing a test generator, please state so here, so that I can mark that exercise as being worked on.

[ErikSchierboom]

And the first test generator has been merged (in #229)! 🎉