Add media explorer from Github

Fixes #61
Mirror pre-commit script

Fixes #25
Special VIP Scanner config for Quickstart

In VIP Quickstart, we want to default the VIP Scanner to
a VIP Theme Review check.

When we turn on theme submissions from the VIP Scanner,
we'll want to send them to the VIP Support address.

See: https://github.com/Automattic/vip-scanner/pull/68
Check if Quickstart is installed in vip-init
Installing PHP CodeSniffer and the WordPress coding standards.

Closes #132
Merge pull request #141 from Mobius5150/phpcs

Installing PHP CodeSniffer and the WordPress coding standards.
Pluggable database credentials
Wrap username/password argument in quotes for curl

If the password contains a space, it's treated as a new
argument if we don't wrap it in a space

Fixes #145
Make DB_HOST pluggable

... in case you want to connect to a remote database. @pengwynn
Merge pull request #146 from developdaly/patch-1

Make DB_HOST pluggable
Revert "Make DB_HOST pluggable"

This reverts commit b5cca874c6022d5c9ddce6a7e7616e7458ca6a33.

It broke my Quickstart. :(

Reopen #146
Getting fatal errors saying the function is undefined.

Can we get an update?
Merge pull request #149 from whyisjake/patch-1

Getting fatal errors saying the function `wpcom_is_vip()` is undefined.
Change CWD to vip-quickstart while the init script is running
Don't ask for WordPress.com credentials

because the repo is public now

Fixes #150
Minimum Vagrant version is 1.4.0

see #147
Change to a directory higher than the vip-init script

We were switching to the directory that the init script
is in, but we really want to switch to the directory that's
one level higher because that's the vip-quickstart root.

Fixes #151
Update Vagrant link in Readme to the new URL

Current URL points to the Vagrant archive downloads.
Use `vagrant --version` instead of Vagrant.require_version for now

It looks like Vagrant.require_version wasn't available early on. For
now we can just use `vagrant --version` to do the check. Later on we
can replace this with a proper Vagrant.require_version call.
i.e.) When we need to updated to 1.5.0 for Rsync support

Fixes: #147
Merge branch 'master' into issue-147