Squashed 'vendor/assets/javascripts/d3/plugins/' changes from c558538..da342b6

da342b6 Add deprecation notice.

git-subtree-dir: vendor/assets/javascripts/d3/plugins
git-subtree-split: da342b67eb0b790a8ebde02aae0e1621c0ffb4d6
Merge commit '43754618a6e1ddc944b90047520091331511968b'

* commit '43754618a6e1ddc944b90047520091331511968b':
  Squashed 'vendor/assets/javascripts/d3/plugins/' changes from c558538..da342b6