keen/pingpong — pull request #14 by zucaritask (2014-11-09 21:47:18+00:00)
Title: Add custom headers to checks

I needed to have the possibility to add custom headers to the requests being made.
With this pull requests `checks.json` can now have a hash containing headers:
```json
{
"checks": [
{
"name": "check with custom headers",
"url": "http://example.com",
"frequency": 5,
"headers": {"HeaderFoo": "foo", "HeaderBar": "bar"},
"method": "GET",
"data": null
}
]
}
```