Support Splunk searches

[moshekaplan]

Idea for a new command:

!splunk <query> - Runs a Splunk query for the last 24 hours (configurable) and returns the number of results and a link to download them.

For example:
!splunk index=web host="*google.com"

The response message might be something like the following:
Your query for 'index=web host="*google.com"' completed in 2.4 seconds and returned 5 results. You can download them here".