Swap out for deprecated hostname

[connor4312]

Fixes #96

[mattrobenolt]

So according to this:

https://github.com/strongloop/express/blob/master/lib/request.js#L391-L395

It sounds like we'd want to check for req.hostname before req.host if the value of req.host is going to change. Then older versions of Express will fall back from req.hostname to req.host just fine.

[connor4312]

Adjusted :)

[YarivGilad]

"express deprecated req.host: Use req.hostname instead ... node_modules/raven/lib/parsers.js:84:19
very easy to fix - I swapped it locally but every time I install the package it throws this error again - please change it. simply replace req.host with req.hostname like the error message suggests.
Thanks
Ajar

[gigablah]

+1. Would love to see this merged.

[mattrobenolt]

derp, this fell under my radar. Sorry about that!