major updates to image rendering to cope with memory issues and blocking browser.

Signed-off-by: Jon Yardley <Jon.Yardley@digitaslbi.com>
removed console.log

Signed-off-by: Jon Yardley <Jon.Yardley@digitaslbi.com>
Merge remote-tracking branch 'origin/development'
Merge branch 'master' of https://github.com/jonyardley/AstroView