expose normalizedScale, height, width and add and afterRender listner
return canvas height and width
restore the unnecessary changes
exposing of the normalized scale and afterRender function
expose slice width and hieght
remove redundant code
use default getters
Add after render in 3dRendered also as its called after rendering
Merge pull request #155 from LabShare/enable_tagging

Enable tagging
handle case where n_count = 0 in trk header
Merge remote-tracking branch 'upstream/master'