Add some new maintainers

[jaxxstorm]

The speed this module moves at, considering the importance to the sensu community and the high usage doesn't really seem acceptable to me.

I would like to see some more maintainers added, or at least the current maintainers actively reviewing pull requests.

[jamtur01]

Are you volunteering? Happy to add anyone who is interested! Sadly, between $Dayjob, other projects, and family, current folks are pretty busy.

[jaxxstorm]

Yes absolutely, I would love to help.

[jamtur01]

Sure. I'll add you as a collaborator. Some rough rules @jlambert121 and I have been working off (and he's definitely done most of the recent work):

1. Nothing added without tests and documentation.
2. We're roughly SemVer - backwards incompatible interface/API changes require appropriate version bumps.
3. Best features for most number of users - avoid custom settings and configuration designed to address edge cases at the expense of ease of use.

[dalesit]

Great news. I have #485 waiting (since March) if someone could have a look - addresses #269 which has been open since November 2014!

[jaxxstorm]

Thanks! I'll get cracking on some of the backlog ASAP!