v0.6.0

• Modernised by @charlesfries (#8)
  • Octanify
  • Upgrade Ember to v3.28
  • Convert to native classes
  • Fix examples
• Updated xlsx to v0.17.0
• Added options to optionally return the generated blob instead of (or as well as) triggering a download
  • Thanks to @colenso for the idea (in #9)
• Added the ability to use an HTMLTableElement instead of a data array for Excel sheets
  • Thanks to @colenso for the idea (in #9)