fixed #518
fixed #521

deleting variable watchers by dropping them on the palette resulted in
wrong ones to be created when showing them again
added Snap! Connectivity Strategy to repo
Scale down oversized images to current stage dimensions

rather than to 480 * 360
Thanks, Dan, for reporting this!
fixed “lost sprites bug”

ensure duplicated sprites keep wearing their current costume through
save and re-load
improve unique sprite- and costume names
Display “empty” Contexts as empty rings

(e.g. continuations). Brian was complaining about empty continuations
“sucking” up the watchers and value bubbles.
new “JavaScript function” primitive

Go figure…
updated credits
Merge branch 'master' into docs

* master:
  updated credits
  new “JavaScript function” primitive
  Display “empty” Contexts as empty rings
  improve unique sprite- and costume names
  fixed “lost sprites bug”
  Scale down oversized images to current stage dimensions
  added Snap! Connectivity Strategy to repo
  fixed #521
  fixed #518
move Snap! connectivity to docs folder