FIX Logut method works with new CSRF

Merge pull request #165 from kinglozzer/updated-logout-step

Update logout step to use new logout form

Work with new checkpassword API and logout urls with CSRF tokens

• BUG Prevent behat from always running root behat.yml fixtures
• API Update to new checkPassword API
• Use canonical logout url for logging out (includes CSRF token when needed)

3.0.0-alpha6: Merge pull request #160 from open-sausages/pulls/4.0/that-old-admin

Fix to download the proper version of silverstripe-admin

3.0.0-alpha5

Merge pull request #158 from robbieaverill/pulls/4.0/consistent-insta…

3.0.0-alpha4

Merge pull request #157 from open-sausages/pulls/fix-fqn-services

API Upgrade to use new AssetStore service name

2.3.6

Update versioned namespace

2.3.5

Merge pull request #151 from dhensby/pulls/phpunit-bump

Bump PHPUnit dep

2.3.3

BUG Ensure safe fallback for missing `.env` file to dev mode.

2.3.0

Merge pull request #147 from open-sausages/pulls/new-bootstrap

Move bootstrap file up into correct point in application cycle

2.2.2

Merge pull request #143 from open-sausages/pulls/4.0/alert-text-check

API Add check for text in current alert