Just to overcome questions.

Not everyone might notice that PHP >= v. 5.4 has its own CLI web server
for local environments.
If not defined checked twice.

Part of my sunday cleanup tour.
Not really 300% sure about this but should do.
Unbloat: Symfony\Component\Filesystem::mkdir use.

Symfony has a component called Filesystem. We have a function in lib
here that does exactly the same thing here. Except it is not unit
tested. And since we already install this component via composer.json,
we shall use it.
Merge branch 'master' of github.com:bolt/bolt
My bad. Sorry.
Before I set any finger on this: make it readable.
Revert "Before I set any finger on this: make it readable."

This reverts commit 49504411f0c07dfa321187d495c248018f7db4f9.
Merge pull request #1176 from doertedev/master

Removing homegrown MakeDir(), cleaning up initialization/constants.