(feat) Set the status to 200 on a succesful file read.
Merge pull request #113 from reem/feat/serve-file-default-status

(feat) Set the status to 200 on a succesful file read.
(fix) Read to a Vec<u8> instead of a String.

This allows non-utf8 files to be served. Previously they failed
during read_to_string(), which caused 500s to be sent.
Merge pull request #114 from reem/feat/serve-nonutf8-files

(fix) Read to a Vec<u8> instead of a String.