Support different exporting formats

Add support for CSV, XLS, XML and other popular output formats to export data beside JSON and JSONP.

Maybe there is support using some npm module and/or in Express itself (must check).

• XML
• CSV

Mentioned in commit 05947dff

mentioned in commit 05947dff

Reassigned to @vsbc14

mentioned in merge request !2 (merged)

Status changed to closed by merge request !2 (merged)