concrete5/concrete5-5.7.0 — pull request #1156 by mlocati (2014-09-19 21:18:05+00:00)
Title: Fix command line installer for PHP 5.3

Marking a parameter as `callable` in PHP 5.3 makes it expects for an instance of a class names `callable`.
This leads to this error when installing via the command line:
```
Argument 2 passed to Concrete\Core\Database\DatabaseManager::extend()
must be an instance of Concrete\Core\Database\callable
instance of Closure given
```