Merge branch 'provide-custom-scss' of https://github.com/stephaniepurvis/bootstrap into stephaniepurvis-provide-custom-scss

scss/_custom.scss

@@ -0,0 +1,4 @@
+// Custom Overrides
+//
+// Copy settings from `_variables.scss` to this file to override
+// the Bootstrap defaults without modifying key, versioned files.

scss/bootstrap.scss

@@ -5,6 +5,7 @@
  */
 
 // Core variables and mixins
+@import "custom";
 @import "variables";
 @import "mixins";