Added. Eating unique index

health_record_id と food_id で unique になる
Added. Eating validate

Eating validate用にhealth_record factoryも追加
Fixed. Eating::AMOUNTS lable -> label

綴り間違え修正
Added. Eating::DEFAULT_AMOUNT

デフォルトのAMOUNTのvalue
Modified. Eating validate delete

health_record_id に対してvalidateをかけていると、eatings_attributesで
更新ができなかったため削除
New. Eating unique index
New. HealthRecordsController#new_eating
modified. HealthRecordsController#new

料理の削除からの追加復帰
Fixed. HealthRecordsController#health_record_params

eatings_attributes _destroy忘れ
Modified. food factory
Modified. HealthRecord view remove link
Modified. food has_many
Modified. Eating validate
Modified. HealthRecord validate
Modified. HealthRecordsController#create
Modified. HealthRecordsController#update
Added. gem 'jquery-turbolinks'
Added. Eating#food_name
Added. HealthRecord#eatings_invalid?
Added. HealthRecord#not_found_food