allow users to override the default template's layout file
allow users to override the default template's layout file

Applying fix that is for JSDoc with commit below;

https://github.com/jsdoc3/jsdoc/commit/cbe34422212fce15bf3c01fac1fc88a5a5cebad6
zech/docstrap,luckylooke/JS.Responsive.jsdocTmpl,docstrap/docstrap,bartvanandel/docstrap,terryweiss/docstrap