Roundcube App for owncloud

Embedd roundcube interface in owncloud

Requirements:

OwnCloud 5.0+ (tested with 5.0 - 7.0.0) for 6.X and 7.x
Bookmarks apps enabled previously
Mailserver with IMAP-Support (prefer in same webserver/host)
Roundcube Webmailclient (tested with roundcubemail-0.7,0.8,0.9 and 1.0, prefer in same webserver/host)
Set the xframe_restriction to false due some issues usage of frames for mail rendering
curl installed for newer 2.5.6 version of plugin, fopen active for olders releases