Add ``featured_list`` in the app_list context.

https://github.com/madewithbytes/us_ignite/issues/234
Use generic featured item in the app list.
Add featured events to the context.

https://github.com/madewithbytes/us_ignite/issues/234
Add featured hubs to the context.

https://github.com/madewithbytes/us_ignite/issues/234
Add featured resources to the context.

https://github.com/madewithbytes/us_ignite/issues/234
Update tests to reflect context updates.
Serve only valid entries in the map.
Fix clashing between homepage featured and list featured object.
Added google analytics tracking code.

https://github.com/madewithbytes/us_ignite/issues/240

The implementation respects any DNT:1 headers.
Update Tag wording.
Decouple specific app detail template from object_detail base.

https://github.com/madewithbytes/us_ignite/issues/265
Decouple specific hub detail template from object_detail base.
Clean up hub detail template.
Add membership details to hub detail page.
Add ``website`` alias to resource URL.
Use an include as contact in the sidebar.
Decouple resource detail template from object_detail base.
Make tags uppercase.
Return list of hubs instead of membership.
Cosmetic: Removed unused mark up.