DRY some npm scripts

`dev` and `prod` are just aliases, so this allows to just defer them to their counterparts.

`watch-poll` just adds one extra argument so the special option `--` allows to pass it to the `watch` script.

NPM scripts should support Windows

Provide consistency with NPM scripts

Add vagrant virtual machine directory to git ignore list.

It trips me up each time that `npm run dev` exists but `npm run prod`
does not. This serves to fix that case, as well as providing consistency
in both directions `dev`/`development` and `prod`/`production`.

[Source](https://twitter.com/michaeldyrynda/status/846507021251690497)

Added changelog

Composer -o

Composer allows us to optimize the autoloader using the --optimize flag or shortly -o.

Require laravel-mix v0.*

Possible URL fix?

The .js files should be vendored too

Some projects can present JS as the primary language, even clearly being a Laravel/PHP project. With this, that problem can be avoided.

unindex token

Mailtrap now reference smtp. for their host value.

Adds unix_socket to config/database.php for consistency

For the mysql driver only (as this only applies to mysql) add the "socket" configuration parameter and corresponding environment variable.

common js style

Upgrade laravel-mix to 0.8.3

Fix cross-env binary