Provides bin script that runs drush on each affiliate.

#### Usage
- `vagrant ssh`
- `cd /var/www/vagrant/`
- `bin/drush-intl status --fields=uri`
  ![image](https://cloud.githubusercontent.com/assets/672669/4942848/71bd6a80-65ef-11e4-94b6-0c23f37f4031.png)

#### What are the relevant tickets?
Closes #3349.
Not necessarily for this PR, but we should really have this list as a variable somewhere.  Lots of gotchas where we miss an affiliate.