Use Select2 for Symptoms search

[theworkerant]

Overview

We want to be able to search our central symptoms table for users to add to their symptoms catalog.

Reference: Flaredown/FlaredownAPI#47

---

• Add a "preferences" route/objectController/template for the purpose of this task, may change later...
• Install Select2
  http://ivaynberg.github.io/select2/

This was done on eVisit, use as reference
https://github.com/larsenb/eVisit/blob/master/app/views/select2.coffee
Not sure what this does, might be related: https://github.com/larsenb/eVisit/blob/master/app/views/selecttrap.coffee

• Connect to SymptomsController#search

Use the select2.query to do this and setup sensible default options. Also setup error handling (Groovy Response Handler).

• "Selecting" a symptom adds it for user, using SymptomsController#create
• Add a list of current active symptoms for current_user