This makes use of the kibana3 logstash dashboard's query and from
parameters to link in queries similar to how we linked in kibana2
queries with base64 encoding. This however uses a saner urlencode
instead of base64 so you should be able to read them as a human.
Note we shouldn't land this until we have switched logstash.o.o over to
kibana3.
Change-Id: Idc1d637db7e1142a24adab2d21bc747d3002dd56
Depends-On: I176148c3bdaf603a1703d215ac2086101ecabe21
206b428681