Change the way Bootstrap is imported to fix build issues

See: angular/angular-cli#9020

Author: mprahl

.angular-cli.json

@@ -19,8 +19,7 @@
       "testTsconfig": "tsconfig.spec.json",
       "prefix": "app",
       "styles": [
-        "styles.scss",
-        "../node_modules/bootstrap/dist/css/bootstrap.min.css"
+        "styles.scss"
       ],
       "scripts": [],
       "environmentSource": "environments/environment.ts",

src/styles.scss

@@ -1,3 +1,4 @@
+@import "~bootstrap/scss/bootstrap";
 $fa-font-path: "../node_modules/font-awesome/fonts";
 @import '~font-awesome/scss/font-awesome.scss';