composer/composer — pull request #350 by Seldaek (2012-02-21 15:47:06+00:00)
Title: Aliasing

Allows to alias versions to override others, for example:

```json
"require": {
"symfony/symfony": "dev-master as 2.1.0"
}
```

This installs dev-master while masquerading it as 2.1.0 - making sure it satisfies any package requiring 2.1.0.