Sync Mastodon IDs/profiles to local accounts

Add a new service to import some data from Mastodon accounts:

* Find users by username, store Mastodon account ID in local db when
  found
* Import display name (don't overwrite existing)
* Import avatar (don't overwrite existing)

app/services/rest_api_service.rb

@@ -1,27 +1,27 @@
 class RestApiService < ApplicationService
   private
 
-    def base_url
-      raise NotImplementedError
-    end
+  def base_url
+    raise NotImplementedError
+  end
 
-    def headers
-      raise NotImplementedError
-    end
+  def headers
+    raise NotImplementedError
+  end
 
-    def endpoint_url(path)
-      "#{base_url}/#{path.gsub(/^\//, '')}"
-    end
+  def endpoint_url(path)
+    "#{base_url}/#{path.gsub(/^\//, '')}"
+  end
 
-    def get(path, params = {})
-      res = Faraday.get endpoint_url(path), params, headers
-      # TODO handle unsuccessful responses with no valid JSON body
-      JSON.parse(res.body)
-    end
+  def get(path, params = {})
+    res = Faraday.get endpoint_url(path), params, headers
+    # TODO handle unsuccessful responses with no valid JSON body
+    JSON.parse(res.body)
+  end
 
-    def post(path, payload)
-      res = Faraday.post endpoint_url(path), payload.to_json, headers
-      # TODO handle unsuccessful responses with no valid JSON body
-      JSON.parse(res.body)
-    end
+  def post(path, payload)
+    res = Faraday.post endpoint_url(path), payload.to_json, headers
+    # TODO handle unsuccessful responses with no valid JSON body
+    JSON.parse(res.body)
+  end
 end