feat: stabilize tmp for v0.2.0 release

[silkentrance]

TODO

• [x] #218 - name must be relative and must not contain path components
• [x] #207 - dir must be relative to default tmp
• [x] #246 - quotes in tmp dirname may cause problems
• [x] #237
• [x] #238
• [x] #236
• [x] #176
• [x] #156
• [x] #240
• [x] update documentation
• [x] fix failing tests (missing SIGINT handler, console.log in lib/tmp.js)
• [x] remove obsolete tests (safely install listeners)
• [x] further code clean up, use let/const instead of var, get rid of process.bindings reference, prefix private functions with an underscore, stop handling old node <v8 behaviours
• [x] drop support for node < v8.17.0 since eslint will no longer work with e.g. v8.1.3 and I am too lazy to figure out when node v8 introduced deconstruction of arrays
• [x] regression on WIN32 when removing handling for old node behaviour regarding SystemError.errno and .code

[silkentrance]

Future TODO

• add missing tests for dir option, non-relative name, dir and template options, tries option, name generation in general

[silkentrance]

darn windows build is now failing with a EBADF, investigating

[silkentrance]

fixed, needed YAWSWA (yet another windows specific work around)

function _isExpectedError(error, errno, code) {
  return IS_WIN32 ? error.code === code : error.code === code && error.errno === errno;
}

[silkentrance]

ATM I do not have time for this, started on a new job and have to get up to speed there first.

[silkentrance]

The travis-ci builds are no longer showing:

https://travis-ci.org/github/raszi/node-tmp/builds/672652698

[silkentrance]

@raszi I think I am done with this PR. I fixed all the issues listed. You might want to have another look and if everything is ok, we can finally merge this and you can make a new 0.2.0 release :rocket:

[raszi]

Nice work @silkentrance