precise that the plugin directory should be named 'carddav'

It was not clear to me that we have to name the plugin dir 'carddav'.
Let's say you cloned rcmcarddav as is, it doesn't work because roundcube then looks for plugins/rcmcarddav/rcmcarddav.php.
Merge pull request #13 from jeekajoo/patch-1

precise that the plugin directory should be named 'carddav'
Merge branch 'dev'
add version 0.9.0 number to user_agent
re-add DEV version to user_agent
increase version number
fix umlauts
fix umlauts
fix error that caused PHOTOs to be base64 encoded twice
tag version 0.9.1
Merge branch 'dev'

Conflicts:
	package.xml
it's january, not april
update version to 0.9.2-dev
do not attempt to base64_decode an empty PHOTO; do not base64_decode more than 10 times
Fix set_group when no group is specified

Some pages that list contacts (e.g. when composing a message) issue a
set_group(0) on the addressbook object.

That means not restricting the search to a group at all, but the plugin
was trying to search for users belonging to a group with id = 0.
Merge pull request #16 from adobo/fix_listing

Fix set_group when no group is specified
check if debugging is enabled before calling the debug or debug_http functions
Merge pull request #17 from InuSasha/master

ignore the config.inc.php file
Provide an option to use only the local part of the email address

In case one uses the email address as username it is sometimes beneficial
to only use the local part of the email address as CardDAV username.
small change to documentation of %l