add mock recommender service for development, add user-context recommended posts

script/mock_services/iqdbs.rb

@@ -0,0 +1,14 @@
+require 'sinatra'
+require 'json'
+require_relative './mock_service_helper'
+
+set :port, 3002
+
+configure do
+  POST_IDS = MockServiceHelper.fetch_post_ids()
+end
+
+get '/similar' do
+  content_type :json
+  POST_IDS[0..10].map {|x| {post_id: x}}.to_json
+end