Irrational Emu

Fixes affecting existing installs

• Replace hard-coded Drupal root in code review tasks with the drupal.root build property (allows running the code-review task on projects with docroots != web)

Fixes affecting new installs

• Update circle.yml for new butler config
• Update the PHP version, Apache config, and other dependency commands to work with the current CircleCI Ubuntu 14.04 image