new OC_Mail class to handle all mail sending. The benefit is that is way mor flexible than the standard mail command. can be configured to use a remote smtp relay for example. also port the lostpassword code

Merge commit 'refs/merge-requests/105' of git://gitorious.org/owncloud/owncloud into merge-requests/105

showing the file extensions more visible by default. I still think it's shitty design, but I get worse nightmares over thinking that showing file extensions would become a configuration option.

https://bugs.php.net/bug.php?id=21641