improve CouchDB performance by implementing "Joins" on repository level

[maxhbr]

It is possible to implement a CouchDB view which does something like a "Join" (see: http://www.cmlenz.net/archives/2007/10/couchdb-joins). This would allow us to requests from CouchDB a list of Projects together with all Releases for the Project sorted by complex keys.

The problem is, how to implement that in Ektorp or how to deserialize the response from CouchDB.

One problem is that the result set may not have mixed result types (like projects and releases) for Ektorp currently. Maybe a contribution for the ektorp project is required.

[mcjaeger]

discussion has been continued here:
#596