title: set titles with name of days in fullcalendar plugin
body: <p>In week mode, There is month/day title in x-axis label.. But I just want to name of day 
  here is current view:
  <a href="https://i.stack.imgur.com/SEAwf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SEAwf.png" alt="enter image description here"></a></p>
  
  <p>You see "Sun 3/6","Mon 3/7","Tue 3/6",.. I want these titles "Sunday","Monday","Tuesday".. Is there any way do this within plugin or I have to implement it manually</p>