Overview  Template with Sub Nav

1. add sub nav at header. it will be similar to blog template. should
support mobile view. this sub nav will show its child pages
2. add external links at sidebar. if no external link configured for
that page, then hide the widget

How To Use
1. Create a new page using "Overview with subnav template" template.
2. Add the external links as custom fields. The custom field name should
be "External Link" and you can add multiple fields with this name.
3.
Create a new menu named "Overview Subnav" and add the sections you wish
to appear in the subnav section.
4. View the page.
5. You can check the behavior of the sidebar if no
"External Link" are added.
make nav read child automatically
Merge pull request #43 from topcoderinc/PEMULA-ADD-SUBNAV

Pemula add subnav