Merge pull request #52 from tollmanz/add-unit-testing-wp-cli-round-2

Add WordPress Core unit testing
README refresh - contributors and Vagrant version
Allow for a flag to disable the checkout and update of WordPress tests
Force .sh scripts to use LF (or as-committed) line endings, even on Windows
Merge pull request #57 from mbijon/master

Force .sh line-endings: Defensive fix for Windows provisioning script error
README refresh
Setup stable WP via latest.tar.gz from WordPress.org rather than SVN

There was no real reason to checkout the repository for the default WordPress install as that isn't meant to be switched around, but instead to be upgraded when new versions of WordPress are released. This should speed up a piece of `vagrant up` a bit.
Ignore externals on svn up for unit tests
Update README to reflect Vagrant 1.2.2 release
Add credentials for various pieces to the README
Add link to MySQL wiki page
Append a custom sources list to the default provided for Apt

Some of the packages included by default with the sources list in Ubuntu 12.04 are way out of date, or boring at the least. This commit allows custom sources to be appended to the list so that we can better control the versions that are installed.

A specific change from this commit is the use of SVN 1.7.9, which should help to resolve file permissions issues on some Windows machines.

Closes #58
Install unzip package during provisioning
Updated CHANGELOG for upcoming 0.6
We no longer use the apt_update_run check
Improved documentation for database import process in bash script
Add group write permissions to wordpress-unit-tests directory

Avoids having to use sudo to do things as the vagrant user with WordPress unit tests.
Add group write permissions to wordpress-trunk and wordpress-default

Allows for easier file manipulation from with the virtual machine without the use of sudo.
Be specific with directory and file permissions when mapping /srv/www

Rather than manually chmod specific directories to have group write access, map the /srv/www directory initially with 775 on directories and 664 on files. This allows for non sudo access to a bunch of stuff.

Reverts previous commits adding chmod statements.
Set a default WP_TESTS_DIR path

PHPUnit relies on a WP_TESTS_DIR path when running outside of the actual tests installation. This provides for that.