Eabled custom dev configuration.

Sometimes it is useful to allow an engineer to point the webclient
at an API not running on localhost. To address this edge case,
I have added src/config.json to .gitignore, and taught grunt how
to copy it during the dev build/deploy phase. If the file is not
found, it is ignored.

Do not merge until an equivalent patch to storyboard/docs is
provided.

Change-Id: I82229f92271d9094ec8ad4b52c38f3bc7ef7fa42

.gitignore

@@ -11,3 +11,4 @@ cover
 .tox
 src/theme/custom/**.less
 src/theme/custom/**.ico
+src/config.json

Gruntfile.js

@@ -230,7 +230,8 @@ module.exports = function (grunt) {
                         src: [
                             '**/*.{txt,eot,ttf,woff}',
                             '*.html',
-                            'robots.txt'
+                            'robots.txt',
+                            'config.json'
                         ]
                     },
                     {

src/config.json.sample

@@ -0,0 +1 @@
+{"storyboardApiBase": "http://storyboard.openstack.org/api/v1"}