Fonts as static files

[therustmonk]

It's impossible to return woff2 font file (and other font types). Reactor returns 0 Kb sized responses.

[process-bot]

Thanks for the issue! Make sure it satisfies this checklist. My human colleagues will appreciate it!

Here is what to expect next, and if anyone wants to comment, keep these things in mind.

[mbr]

Same issue on elm-reactor 0.18 on Linux.