Getting wrong `danger` object when Peril runs a Dangerfile

Hello, I've been trying to set up Peril locally by following [the docs](https://github.com/danger/peril/blob/master/docs/local_dev.md). Everything works fine until I try to run a Dangerfile.

I cloned the `danger/peril-settings` and did some small changes to the `settings.json` file, leaving only the `markAsMergeOnGreen.ts` and `mergeOnGreen.ts`.

When I get a github hook for a `issue_comment`, Peril tries to run the `markAsMergeOnGreen.ts` that I specified on my `settings.json`, but the `danger` object is not the [DangerDSL](https://github.com/danger/danger-js/blob/master/source/dsl/DangerDSL.ts), which is what I'm expecting.

I added a `console.log(danger)` on the dangerfile, and found out that the object was actually a [IssueCommentEvent payload](https://developer.github.com/v3/activity/events/types/#issuecommentevent) as I show in the logs below.

Not sure if that's a bug or if I'm doing something very wrong. Can someone give me a light?

Thank you!

Logs:
```
yarn run v1.15.2
$ node out/index.js
info:
info: ☢️ Starting up Peril
info: ⅹ Papertrail
info: ⅹ Clustering
info: ✓ JSON Db at lalainc/peril-settings@settings.json
info: ✓ Server:
info: - Local: http://localhost:5000
[winston] Unknown logger level: router
info:
info: ## issue_comment.created on unknown on LalaInc/coindar-ios
info: 1 run needed: lalainc/peril-settings@org/markAsMergeOnGreen.ts
@babel/polyfill is loaded more than once on this page. This is probably not desirable/intended and may have consequences if different versions of the polyfills are applied sequentially. If you do need to load the polyfill more than once, use @babel/polyfill/noConflict instead to bypass the warning.
-- DANGERR ---------------
{ github:
{ action: 'created',
issue:
{ ... },
comment:
{ ... },
repository:
{ ... },
organization:
{ ... },
sender:
{ ... },
installation:
{ ... } } }
TypeError: Cannot read property 'orgs' of undefined
at Object.exports.default (/path/to/peril/api/danger-0.wfe3bdnkd99.ts:33:19)
at Object. (/path/to/peril/api/node_modules/danger/distribution/runner/runners/inline.js:147:60)
at step (/path/to/peril/api/node_modules/danger/distribution/runner/runners/inline.js:32:23)
at Object.next (/path/to/peril/api/node_modules/danger/distribution/runner/runners/inline.js:13:53)
at /path/to/peril/api/node_modules/danger/distribution/runner/runners/inline.js:7:71
at new Promise ()
at __awaiter (/path/to/peril/api/node_modules/danger/distribution/runner/runners/inline.js:3:12)
at Object.exports.runDangerfileEnvironment (/path/to/peril/api/node_modules/danger/distribution/runner/runners/inline.js:105:136)
at runDangerAgainstFileInline (/path/to/peril/api/out/danger/danger_runner.js:49:37)
at process._tickCallback (internal/process/next_tick.js:68:7)
Sender does not have permission to merge
```