title: Mongoose - Array in Schema not working + Mongoose find/match element in array
body: <h1>Issue one</h1>
  <p>For some reason, when I post to my API using Postman (x-www-form-urlencoded), the Array of strings I created in the Schema (see below under issue 2) aren't being separated when I post using Postman. Either i'm not correctly posting, or I haven't set up my Schema correctly.</p>
  <p>However I have tried multiple different ways of doing both. I originally had [String] in the Schema, I tried setting the key in Postman to day[] etc. but nothing seemed to work. Any ideas?</p>
  <h1>Issue Two</h1>
  <p>(which cannot be completed until I get to the bottom of issue one.)</p>
  <p>I am trying to return all results that contain 'friday' in the 'days' Array in the Schema, but I have searched everywhere and can't find this.</p>
  <p>So given the Schema:</p>
  <pre><code>var PeopleSchema = new Schema({
     name: {
         type: String,
         required: true
     },
     days: {type: [String]}
  });
  </code></pre>
  <p>and this data:</p>
  <pre><code>{ 
       _id: 1,
       name: 'Brian Smith',
       days: [ 'friday', 'monday', 'tuesday' ],
       available: true,
  },
  { 
       _id: 2,
       name: 'Fred Hill',
       days: [ 'friday', 'wednesday', 'saturday' ],
       available: true,
  }
  </code></pre>
  <p>I would like to find/match all results with say, 'friday' in the days Array. How would I do this?</p>
  <p>Thanks very much</p>