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
[issue-153] Allow php54 to be downloaded behind corporate firewall
Merge pull request #154 from pkevan/master

[issue-153] Allow php54 to be downloaded behind corporate firewall

Downloads php5.4 over port 80.
Bump wp-cli puppet module
Install WordPress with the Vagrant user
Install Ubuntu upgrades on remote servers
Bump wp-cli module to fix AWS
Only show the next steps if this is the first run