title: highchart save image using exporting java and phantomjs
body: <p>I was able to setup exporting module using java and phantomjs. I am also able to see the image file getting generated in temp folder but it gets deleted after some time 30 secs to be exact. After going through API definition I found something called as async which caught my eyes. I tried playing around with this option but didnt worked. Image file gets deleted evertime, I want to permanently save this file on file system. Any pointers in this directions would be very helpful.</p>
  
  <p>Thanks</p>