When phpci is default, it should be used.

The installer displays `phpci` as placeholders for the database settings (database and username).

When I do not change them the installer fails with this error:

`Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[3D000]: Invalid catalog name: 1046 No database selected' in /Users/tobias/Sites/PHPCI/vendor/block8/b8framework/b8/Database/Map.php on line 40`

I assume it is simply because they are not set. This pull requests uses the given values, or phpci as default.

In theory I would assume all the configuration values should be checked somehow. Is this just not implemented, or is it not desired?
Merge pull request #256 from tobiastom/patch-1

When phpci is default, it should be used.