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Revert "Merge pull request #1 from woshidan/change-minitest"

This reverts commit ce52dc2a45ebf60799731bb0024f0cc86e896fac, reversing
changes made to e025d718e39241785808cc2b7ce21df9b5abf1bf.
add spec_helper
add spec directory
write first API test which means GET /api/v1/fish request should not return an empty array
add routing to mounting
modify JSON in api_spec.
make factory for Fishes
modify test to see if multiple fish
modify spec_helper not to contain unextra command
make testfile for view using API
write seed.rb to prepare the test data.
Merge pull request #2 from woshidan/write-API

GETリクエストを受けて、おさかなのデータが入ったJSONを返すAPI