Create algebra for persistence services

[franciscodr]

We should create algebras for all the persistence services.

[franciscodr]

QA instructions

This issue changes the way how the persistence services work. So you should check that the endpoints that need information from the database keep working as before.

You should run both nine-cards-backend and nine-cards-backend-google-play apps:

• nine-cards-backend: sbt -Dconfig.file=modules/api/src/main/resources/localhost.conf
• nine-cards-backend-google-play : sbt run

Some endpoints that you should check are:

1. Get subscriptions

   curl -X "GET" "http://localhost:8080/collections/subscriptions" \
   -H "X-Auth-Token: 12345" \
   -H "X-Android-Market-Localization: en-US" \
   -H "X-Session-Token: <enter-session-token>" \
   -H "X-Android-ID: <enter-android-id>"

2. Rank apps

   curl -X "POST" "http://localhost:8080/applications/rank" \
   -H "X-Auth-Token: 12345" \
   -H "Content-Type: application/json" \
   -H "X-Session-Token: <enter-session-token>" \
   -H "X-Android-ID: <enter-android-id>" \
   -d $'{
   "location": "IT",
   "items": {
    "GAME_SPORTS": [
      "com.firsttouchgames.story",
      "com.miniclip.soccerstars"
      ],
    "FINANCE": [
      "com.cajasur.android",
      "www.ingdirect.nativeframe"
      ],
    "WEATHER": [
      "cz.windguru.wgapp"
      ]
    }
   }'

[fedefernandez]

Works flawlesly, good job.