[GET] Request tests for users endpoints

- [ ] Users
  - [x] Getting Users - GET https://api.crowdmap.com/v1/users(/:user_id)/
  - [x] Getting Users Posts - GET https://api.crowdmap.com/v1/users/:user_id/posts/
  - [ ] Avatars
    - [ ] Getting Avatars - GET https://api.crowdmap.com/v1/users/:user_id/avatar/
  - [ ] Relationships
    - [ ] Get Users Followed By User - GET https://api.crowdmap.com/v1/users/:user_id/follows/
    - [ ] Verify Following Relationship - GET https://api.crowdmap.com/v1/users/:user_id/follows/:follower_id/
    - [ ] Getting Users Followers - GET https://api.crowdmap.com/v1/users/:user_id/followers/
  - [x] Users & Maps
    - [x] Getting Followed Maps - GET https://api.crowdmap.com/v1/users(/:user_id)/maps/following/
    - [x] Getting Maps Collaborating On - GET https://api.crowdmap.com/v1/users(/:user_id)/maps/collaborating/
    - [x] Getting Users Maps - GET https://api.crowdmap.com/v1/users(/:user_id)/maps/owns/
    - [x] Getting Users Associated Maps - GET https://api.crowdmap.com/v1/users(/:user_id)/maps/associated/
  - [ ] Notifications 
    - [ ] Get Users Notifications - GET https://api.crowdmap.com/v1/users/:user_id/notifications/
https://api.crowdmap.com/v1/users/:user_id/notifications/:notification_id/
  - [ ] Posts
    - [x] Getting Posts - GET https://api.crowdmap.com/v1/posts(/:post_id)/
    - [ ] Tagging Posts
      - [ ] Getting Tags - GET https://api.crowdmap.com/v1/posts/tags(/:tag)/
      - [ ] Getting a Posts Tags - GET https://api.crowdmap.com/v1/posts/:post_id/tags(/:tag)/
    - [ ] Comments
      - [ ] Getting Posts Comments - GET https://api.crowdmap.com/v1/posts/:post_id/comments(/:map_id)/
    - [ ] Post to Map Relationships
      - [x] Getting Maps a Post is Posted To - GET https://api.crowdmap.com/v1/posts/:post_id/maps/