Update deps for latest composer deps

Satis is currently not installable with a fresh clone of the repository. Getting this error:

```
# composer install

 [RuntimeException]                                                                                                            
  Your composer.lock was created before 2012-09-15, and is not supported anymore. Run "composer update" to generate a new one.  
                                                                                                           
```

```
# composer update

Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Conclusion: don't install symfony/console v2.1.12
    - Conclusion: don't install symfony/console v2.1.11
    - Conclusion: don't install symfony/console v2.1.10
    - Conclusion: don't install symfony/console v2.1.9
    - Conclusion: don't install symfony/console v2.1.8
    - Conclusion: don't install symfony/console v2.1.7
    - Conclusion: don't install symfony/console v2.1.6
    - Conclusion: don't install symfony/console v2.1.5
    - Conclusion: don't install symfony/console v2.1.4
    - Conclusion: don't install symfony/console v2.1.3
    - Conclusion: don't install symfony/console v2.1.2
    - Conclusion: don't install symfony/console v2.1.1
    - Conclusion: don't install symfony/console v2.1.0
    - Conclusion: don't install symfony/symfony v2.1.12
    - Conclusion: don't install symfony/symfony v2.1.11
    - Conclusion: don't install symfony/symfony v2.1.10
    - Conclusion: don't install symfony/symfony v2.1.9
    - Conclusion: don't install symfony/symfony v2.1.8
    - Conclusion: don't install symfony/symfony v2.1.7
    - Conclusion: don't install symfony/symfony v2.1.6
    - Conclusion: don't install symfony/symfony v2.1.5
    - Conclusion: don't install symfony/symfony v2.1.4
    - Conclusion: don't install symfony/symfony v2.1.3
    - Installation request for composer/composer dev-master -> satisfiable by composer/composer[dev-master].
    - Conclusion: don't install symfony/symfony v2.1.2
    - Conclusion: don't install symfony/symfony v2.1.1
    - composer/composer dev-master requires symfony/finder ~2.2 -> satisfiable by symfony/symfony[v2.2.0, v2.2.1, v2.2.2, v2.2.3, v2.2.4, v2.2.5, v2.2.6, v2.3.0, v2.3.1, v2.3.2, v2.3.3, v2.3.4], symfony/finder[v2.2.0, v2.2.1, v2.2.2, v2.2.3, v2.2.4, v2.2.5, v2.2.6, v2.3.0, v2.3.1, v2.3.2, v2.3.3, v2.3.4].
    - Can only install one of: symfony/symfony[v2.3.0, v2.1.0].
    - Can only install one of: symfony/symfony[v2.3.1, v2.1.0].
    - Can only install one of: symfony/symfony[v2.3.2, v2.1.0].
    - Can only install one of: symfony/symfony[v2.3.3, v2.1.0].
    - Can only install one of: symfony/symfony[v2.3.4, v2.1.0].
    - don't install symfony/finder v2.2.0|don't install symfony/symfony v2.1.0
    - don't install symfony/finder v2.2.1|don't install symfony/symfony v2.1.0
    - don't install symfony/finder v2.2.2|don't install symfony/symfony v2.1.0
    - don't install symfony/finder v2.2.3|don't install symfony/symfony v2.1.0
    - don't install symfony/finder v2.2.4|don't install symfony/symfony v2.1.0
    - don't install symfony/finder v2.2.5|don't install symfony/symfony v2.1.0
    - don't install symfony/finder v2.2.6|don't install symfony/symfony v2.1.0
    - don't install symfony/finder v2.3.0|don't install symfony/symfony v2.1.0
    - don't install symfony/finder v2.3.1|don't install symfony/symfony v2.1.0
    - don't install symfony/finder v2.3.2|don't install symfony/symfony v2.1.0
    - don't install symfony/finder v2.3.3|don't install symfony/symfony v2.1.0
    - don't install symfony/finder v2.3.4|don't install symfony/symfony v2.1.0
    - Can only install one of: symfony/symfony[v2.2.0, v2.1.0].
    - Can only install one of: symfony/symfony[v2.2.1, v2.1.0].
    - Can only install one of: symfony/symfony[v2.2.2, v2.1.0].
    - Can only install one of: symfony/symfony[v2.2.3, v2.1.0].
    - Can only install one of: symfony/symfony[v2.2.4, v2.1.0].
    - Can only install one of: symfony/symfony[v2.2.5, v2.1.0].
    - Can only install one of: symfony/symfony[v2.2.6, v2.1.0].
    - Installation request for symfony/console 2.1.* -> satisfiable by symfony/console[v2.1.0, v2.1.1, v2.1.10, v2.1.11, v2.1.12, v2.1.2, v2.1.3, v2.1.4, v2.1.5, v2.1.6, v2.1.7, v2.1.8, v2.1.9], symfony/symfony[v2.1.0, v2.1.1, v2.1.10, v2.1.11, v2.1.12, v2.1.2, v2.1.3, v2.1.4, v2.1.5, v2.1.6, v2.1.7, v2.1.8, v2.1.9].

```