Adding prompt for Windows to capture the Quickstart Domain.

Added a prompt to vip-init.ps1 to capture the domain the user would like
to setup the quickstart vm with for windows machines. This allows the user
to customize the default "vip.dev" domain.

See: #94
Added prompt for Linux to capture the Quickstart Domain.

Added prompt to bin/vip-init to capture the domain the user would like to setup the quickstart vm with.

See: #94, d5f6fa0
Enable custom domains

See #94
Merge branch 'master' of https://github.com/Mobius5150/vip-quickstart into Mobius5150-master
Merge branch 'Mobius5150-master' into feature-custom-domain
Turn on custom domains for unix

We were hard-coding the domain to vip.dev
DOMAIN_CURRENT_SITE is automatically set to HTTP_HOST if it's not set
otherwise
Only install WordPress if a domain is set
No need to manually modify the xdebug config. The Puppet module does it
for us
Installing themes needs WordPress to be installed :)

see #123
Default URL for WP-CLI

With the addition of custom domains, WP-CLI was broken because we
no longer define DOMAIN_CURRENT_SITE. Passing a `--url` fixes it.

Here we add a wp-cli.local.yml that won't be under version control
as a place to put the default URL.

See #94
Merge pull request #125 from Automattic/feature-custom-domain

Feature custom domain