Add Critical Severity

[zpriddy]

This adds a 4th severity of Critical. This is very helpful if you want to trigger pages off of only Critical Alerts or Cases

This does change the color of items so there may want to be some talk around it

[zpriddy]

[zpriddy]

This may actually start to cover #11

[crackytsi]

@zpriddy Hi, Thanks for adding so many interesting PRs. Unforunately it seems that your PRs aren't seperated, so the new status and critical severity are combined.
Are you able to split that?

[zpriddy]

Yeah I noticed that. I can split those out.

…

On Tue, Mar 19, 2019 at 2:01 PM crackytsi ***@***.***> wrote: @zpriddy <https://github.com/zpriddy> Hi, Thanks for adding so many interesting PRs. Unforunately it seems that your PRs aren't seperated, so the new status and critical severity are combined. Are you able to split that? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#926 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABxcd7VZkOG3VgBUWq0O1dFd_V_UARnnks5vYVAdgaJpZM4b10nB> .

[zpriddy]

Replacing with #939