Allow building/releasing of logstash plugins w/ opsbot

Also:
- add purbon as a logstash team member

Tests passing.

Fixes #2
Version bump
more verbose error when reading the gem_specification

Fixes #5
Save exceptions to a redis queue

Fixes #5
Do not invoke ruby with /usr/bin/env

Fixes #5
Code reviews fixes

Fixes #5
use stderr instead of strderr

Fixes #5
JSON.parse does not keep the hash ordering

Fixes #5
make jarvis leave a comment in the issue when sucessfully merged

Fixes #6
Adding explain command for errors
Merge pull request #10 from ph/fix/new-command-for-exception

Adding explain command for errors