Update Ember to 3.1

app/styles/bourbon/functions/_contains.scss

@@ -0,0 +1,31 @@
+@charset "UTF-8";
+
+/// Checks if a list contains a value(s).
+///
+/// @access private
+///
+/// @param {List} $list
+///   The list to check against.
+///
+/// @param {List} $values
+///   A single value or list of values to check for.
+///
+/// @example scss - Usage
+///   contains($list, $value)
+///
+/// @return {Bool}
+
+@function contains($list, $values...) {
+  @if $output-bourbon-deprecation-warnings == true {
+    @warn "[Bourbon] [Deprecation] `contains` is deprecated and will be " +
+    "removed in 5.0.0.";
+  }
+
+  @each $value in $values {
+    @if type-of(index($list, $value)) != "number" {
+      @return false;
+    }
+  }
+
+  @return true;
+}