Add font-awesome.scss and font-awesome.less to bower.json

Fix #6780 #6227

bower.json

@@ -7,8 +7,8 @@
   "devDependencies": {},
   "license": ["OFL-1.1", "MIT", "CC-BY-3.0"],
   "main": [
-    "./css/font-awesome.css",
-    "./fonts/*"
+    "less/font-awesome.less",
+    "scss/font-awesome.scss"
   ],
   "ignore": [
     "*/.*",