Added default value for $fromTime to prevent missing argument errors and
keep backward compatible.

Changed method signature of relative_modified_date template method to
make it possible to add a fromTime to compare with, mostly to make it
possible to test it.

Added unit test for date and time cases.

Improved the template function relative_modified_date by adding an
optional dateOnly argument which will output "today" or "yesterday" or
"x days ago".

put the current version and edition into a seperate file to simplify packaging. introduce update channels and build version for automated channel updates. More about that later

Conflicts:
	lib/ocsclient.php
	lib/util.php

Shoudn't make a difference in this case but just in case

Conflicts:
	lib/ocsclient.php

Conflicts:
	lib/private/vcategories.php

SabreDAV uses cURL for the requests and as this does not honour
default_socket_timeout, setting it is useless and confusing as
people will expect the request to timeout faster than it actually
will do.

One has to use
 curl_setopt($curl, CURLOPT_TIMEOUT, x)
or
 curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, x)
but there is currently no way to make SabreDAV pass this to cURL.