Merge remote-tracking branch 'upstream/develop' into develop

Author: rohmanhm

README.md

@@ -30,4 +30,6 @@ npm run test
 
 ```
 
+> Make sure you have installed `less` globally on your machine by running `npm install less --global` before build **uikit**
+
 For detailed explanation on how things work, checkout the [guide](http://vuejs-templates.github.io/webpack/) and [docs for vue-loader](http://vuejs.github.io/vue-loader).

package.json

@@ -8,7 +8,6 @@
     "dev": "node build/dev-server.js",
     "build": "node build/build.js",
     "build:uikit": "cd node_modules/uikit && npm install && npm run compile && node ../../build/uikit.js",
-    "preinstall": "npm install less -g",
     "unit": "cross-env BABEL_ENV=test karma start test/unit/karma.conf.js --single-run",
     "e2e": "node test/e2e/runner.js",
     "test": "npm run unit && npm run e2e",

src/components/canvas/Elements.vue

@@ -211,6 +211,7 @@ export default {
 
         const targetId = target.getAttribute(SelectorAttrId)
         let dropline = {
+          index: 0,
           element: targetId,
           target: targetId,
           position: {},