First pass at Windows installer

* vip-init.bat prompts for UAC and launches the powershell script
* vip-init.ps1 is the powershell script that sets everything up

When you double click a powershell script in Windows, it just opens in a
text editor. When you double click a .bat file it runs.
Pin WP-CLI to v0.12.0

Keeping WP-CLI on v0.12.0 so we always know what version we're on. We
can bump it manually in the future and fix  stuff that may break. Fixes
#13
Fix Vagrantfile

* There was some brokenness when we set the hostname.
* Maps the MySQL port locally
Update README with Windows instructions

The Windows installer works now, so we should update the README to
reflect that
Merge branch 'master' into windows

Conflicts:
	Vagrantfile
Turn on the MP6 style guide

Background: http://helen.wordpress.com/2013/10/04/mp6-ui-components/
Uninstall APC for now

APC was causing an issue with redeclaring the comment list table class

Fixes #51
Install ClamAV for antivirus scanning

Mostly for use w/ VIP Scanner, which supports AV scanning when
`clamscan` is callable.

Fixes #55
Temporarily turn off clamav installer

See #55
Remove the APC config for people that had it installed. APC caused some
brokenness so we removed it, but the config is probably still sitting
there
Let the VM handle SVN checkouts if the host can't

1. Ask for a WordPress.com username and password
2. Set facter facts with the SVN username and password
3. If the directories don't exist, do a checkout using the auth
that we collected (for the shared plugins repo)

This only does the SVN checkout if the directory doesn't exist.
In the case of the shared plugins repo, it also requires that
we give it a username and password.

The SVN up only happens if `svn info` returns succesful. If it's
not an SVN repo or a different version of SVN was used to do the
checkout, the exit code won't be 0 so we won't try to `svn up`.

Note: If the username and password were wrong, it's going to cause
stuf to fail. We should probably introduce better error handling

see #31, #58
Add TODO: Verify WordPress.com username and password are correct
Merge branch 'windows' of https://github.com/Automattic/vip-quickstart into windows
Merge branch 'master' into windows
Upgrade subversion version
Clean up puppet manifests
Merge branch 'master' into windows
Only run the SVN installer once
If SVN isn't installed, ask for a WordPress.com username and password
so we can offload the SVN checkout to the VM
Remove SVN from list of requirements

see #31