Update to use Bootstrap beta release

FEDX-375

themes/red-theme/lms/static/sass/partials/bootstrap/_theme.scss

@@ -3,11 +3,25 @@
 // Theme colors
 //
 // Note: define colors needed by your theme first
+
+// Define the primary red color
 $red: #d9534f !default;
-$brand-primary: $red;
 
 // Theme fonts
 $font-family-sans-serif: cursive;
 
-// Initialize the Open edX bootstrap theme
+// Initialize the Open edX Bootstrap theme
 @import 'edx-bootstrap/sass/open-edx/theme';
+
+// Override the theme to use red as primary
+$theme-colors: ();
+$theme-colors: map-merge((
+  primary: $red,
+  secondary: $gray-600,
+  success: $green,
+  info: $cyan,
+  warning: $yellow,
+  danger: $red,
+  light: $gray-100,
+  dark: $gray-800
+), $theme-colors);