tests: Tracking migration to hspec with fail-fast.

[rbasso]

Tracking migration to hspec with fail-fast

This issue is just for tracking. If you are interested in the discussion, please see #190.

Preparing

• Create branch hspec-fail-fast

Migrating all exercises

• Completely rewrite the test to use hspec with fail-fast.
• Update test cases to match x-common, if needed.
• Update package.yaml.
• Merge PR to hspec-fail-fast master

Exercises

• leap
• accumulate
• sublist
• grains
• gigasecond
• bob
• sum-of-multiples
• strain
• hamming
• rna-transcription
• space-age
• anagram
• phone-number
• nucleotide-count
• grade-school
• simple-linked-list
• list-ops
• word-count
• etl
• robot-name
• meetup
• beer-song
• triangle
• scrabble-score
• roman-numerals
• binary
• prime-factors
• raindrops
• allergies
• atbash-cipher
• all-your-base
• bank-account
• crypto-square
• kindergarten-garden
• robot-simulator
• queen-attack
• binary-search-tree
• difference-of-squares
• hexadecimal
• largest-series-product
• luhn
• clock
• matrix
• house
• minesweeper
• ocr-numbers
• octal
• trinary
• wordy
• food-chain
• linked-list
• custom-set
• nth-prime
• palindrome-products
• pascals-triangle
• pig-latin
• pythagorean-triplet
• saddle-points
• say
• secret-handshake
• series
• sieve
• simple-cipher
• connect
• parallel-letter-frequency
• sgf-parsing
• go-counting
• zipper
• forth
• lens-person
• pov

Testing

• Clear Travis-CI cache.
• Check if build and rebuild times are reasonable.

Merging and cleaning up

• Merge hspec-fail-fast on master.
• Delete branch hspec-fail-fast.
• Clear Travis-CI cache and rebuild.

This accidentally fixes #263.
Closes #190.