listFiles must honor globbing better

[discordier]

listFiles() should not fetch all files and filter them after then.

For slow FS this is plain evil.

i.e.: glob = lib/*

FTP fetches all dirs in root but could rule all except fot /lib out forehand.

[tristanlins]

According to our call you wan't recursive glob patterns like lib/**, not recursive listing with globing.

[leofeyer]

When you are working on this, you might want to look into the Symfony Finder improvements.

http://symfony.com/blog/new-in-symfony-2-2-finder-improvements
https://gist.github.com/jfsimon/3230139
symfony/symfony#4061

They are using native commands where available instead of the PHP functions.

[tristanlins]

We need to check the performance and implementation details.