Update for framework v0.5

[amygroshek]

Auth tool version: v0.10.3
Framework version: v0.5.4
Theme: vanilla

Course export on the AT turns up the following error. It goes away when the plugin is deleted from the AT.

Command failed: grunt server-build:prod --outputdir=courses/5ebc1dbb7268623938f00056/5ebd1f239d6ed208d7c6c966/build --theme=5ebc20e06ab31b39cd1c8661 --menu=adapt-contrib-boxMenu

Fatal error: {
 "message": "variable @primary-color is undefined",
 "type": "Name",
 "filename": "src/components/adapt-stacklist/less/stacklist.less",
 "index": 178,
 "line": 10,
 "column": 19,
 "callLine": null,
 "extract": [
  "\tmargin-bottom: @item-margin;",
  "\tbackground-color: @primary-color;",
  "\tcolor: @primary-color-inverted;"
 ]
}�