Add file type - to be used to indentify source.
Add site pages support
 - Supported pages: landing, offline, thank-you and other
Add ability set default (required) pages
Add ability to set thank you page specific to a help topic.
Migrate Email Templates to a row-based data model
Use DB based pages for landing, offline and thank-you pages.
DB patch for federated email templates and site pages
Merge pull request #604 from greezybacon/feature/pages

Add customer-facing pages and federated email templates

Reviewed-By: Jared Hancock <jared@osticket.com>