Bumpup swagger ui to 2.1.4 to fix the issues in 2.1.0

This commit resolves some issues on generating REST API request,
such as incorrect content-type generation for http DELETE request.

Change-Id: I70bf18247f95ccf22b1fd77bc48ce9977ff57212
diff --git a/web/api/src/main/resources/docs/index.html b/web/api/src/main/resources/docs/index.html
index 5a52222..20f0c7e 100644
--- a/web/api/src/main/resources/docs/index.html
+++ b/web/api/src/main/resources/docs/index.html
@@ -21,6 +21,7 @@
     <script src='lib/highlight.7.3.pack.js' type='text/javascript'></script>
     <script src='lib/marked.js' type='text/javascript'></script>
     <script src='lib/swagger-oauth.js' type='text/javascript'></script>
+    <script src='lib/jsoneditor.min.js' type='text/javascript'></script>
 
     <script type="text/javascript">
         $(function () {