Pre-Submission Checklist

• Opened an issue discussing these changes before opening the PR
• Ran the linter and tests via make prepush
• Included comprehensive and convincing tests for changes

Issues

Closes:

• Issue Node crashes when URL path contains nullbyte (%00) #1864
• Issue Directory traversal security vulnerability in serveStatic #1910
• Issue Restify.plugins.serverStatic option "appendRequestPath" is bugged #1604

Well the most important is the directory traversal from #1910.
And because of there are the other related problems in the serveStatic plugin,
I've combined the stuff.

Changes

There should be no dependency on the dirname for specific path.
Introduced BadRequestErrors for problems on bad paths like urlencoded null bytes.
Added tests to check for traversals.
Reworked existing tests for making more sense.
Remove 2 doubled tests.
lints and style of bodyReader.test fixed to get prepush to run