Add option of showing last value in stats panel

[lookastar]

Add a new parameter in the stats panel for getting the last value of the
specified field. For this, a new multisearch query was inserted in the
code.

[spalger]

Woops! Sorry about that! We recently replaced the master branch with Kibana 4. This action force closed all of the old pull requests against master. We will be reviewing these on a case-by-case basis and creating new tickets as necessary.

The good news is that many long requested features can be found in Kibana 4, and we're being entirely open about our roadmap. Check out the roadmap tickets (which we're still filling in) here.

If you're looking for the old Kibana 3 code you can find it here.

[w33ble]

We're stopping development on Kibana 3 and focusing on Kibana 4 going forward so this can't be merged directly. Also, it looks like this is something that would need to be implemented in Elasticsearch, not something Kibana needs to add.