Merge pull request #1992 from MWDelaney/master

Adapt to use Bootstrap 4 Beta 2 functions and variables

resources/assets/styles/common/_variables.scss

@@ -0,0 +1,3 @@
+$theme-colors: (
+  primary: #27ae60
+);

resources/assets/styles/main.scss

@@ -1,4 +1,6 @@
+@import "~bootstrap/scss/functions";
 @import "common/variables";
+@import "~bootstrap/scss/variables";
 
 /** Import everything from autoload */
 @import "./autoload/**/*";