Issue #138: Backporting dropbuttons from https://drupal.org/node/1608878 and https://drupal.org/node/1480854.
Issue #138: Correcting a few stray lowercase links in drop buttons.
Issue #138: Fixing tests affected by dropbutton additions.
Issue #138: Fixing taxonomy test affected by dropbutton addition.
Merge pull request #106 from quicksketch/138/dropbuttons

Issue #138: Backporting dropbuttons from D8