Display progress on database indexing

[jpfiset]

When a user first load a Nunaliit page, if the database in indexing, then there is a definite lag before the page is shown. To the end user, it looks like the site is broken.

This happens with CouchDb, since indexing is lazy. It waits until a design document is accessed before it indexes the views in it.

The indexing status and its progress is available from CouchDb. It is located at /_active_tasks This URL is not visible to an end user.

It would be possible for the Nunaliit server to track the _active_tasks URL and report the status to the front end application. This would allow informing the end user that the database is busy and how far along it is.

[ahayes]

I think I'd rather investigate the implications of Issue #625 to eliminate the hang while reindexing before building user-facing code to make them wait.