Compatibility with Ansible 1.6.8

Ansible 1.6.8 broke the way the `install WP` command was parsed. This
patch fixes that issue.

https://github.com/roots/bedrock-ansible/issues/21
Merge pull request #22 from austinpray/ansible1.6.8fix

Compatibility with Ansible 1.6.8
Ignore .vagrant folder
Merge pull request #23 from austinpray/addGitignore

Ignore .vagrant folder
correct ubuntu/trusty64 typo
Merge pull request #24 from etcook/master

Minor typo in the readme for ubuntu/trusty64
Improve organization and structure

* separate group_vars/all into environments
* Add environment hosts files
* Consistent YAML formatting
Update README
Merge pull request #25 from roots/re-org

Improve organization and structure
Put domain names first in site_hosts array

When accessing $_SERVER['SERVER_NAME'] through PHP on Nginx, the first
host in the Nginx conf is used. This makes SERVER_NAME return the
domain name instead of the IP.
Add support for mysql root password
Merge pull request #28 from roots/mysql-passwords

Add support for MySQL root passwords
Add memcached
Merge pull request #29 from roots/memcached

Add memcached
Better development hosts file for Vagrant
Limit some roles to staging and production