title: Querying Firebase Database to get a filtered list
body: <p>So basically I am using Vuejs and have a Firebase Database which has holidays{}.
  Inside holidays it has 
  <code>{title:'example 1', start:'2018-01-01', end:'2018-01-05'}
  {title:'example 2', start:'2018-01-05', end:'2018-01-09'}</code></p>
  
  <p>I then want to pass a date '2018-01-03'. The query should check if this date is on or between the 'start or 'end' and give me back all the objects which are.</p>
  
  <p>Any help would be appreciated</p>