Push down require-css to its users

Eg. out of amber, add to helios and amber-attic.

bower.json

@@ -14,6 +14,7 @@
     "jquery-ui": ">=1.9.2",
     "bootstrap2.3.2": "^2.3.2",
     "codemirror": "^4.7.0",
-    "showdown": "^0.3.1"
+    "showdown": "^0.3.1",
+    "require-css": "^0.1.2"
   }
 }

require-css.amd.json

@@ -0,0 +1,10 @@
+{
+    "paths": {
+        "require-css": "."
+    },
+    "map": {
+        "*": {
+            "css": "require-css/css"
+        }
+    }
+}