Add X-Accel-Redirect support for Nginx (a sibiling of X-Sendfile)

For it to work you have to modify your nginx conf to send X-Accel-Mapping header using
-> proxy_set_header X-Accel-Mapping /var/www/ajaxplorer/data/=/data/;
or
-> fastcgi_param X-Accel-Mapping /var/www/ajaxplorer/data/=/data/;
and you have to use the "internal" keyword
-> location ~ /data/ { internal; }

The X-Accel-Mapping idea come from the rails world
New ability in FormManager button: simply trigger client action.
Always pass an ID for the event (not only alerts), and keep track of the last passed ID: triggers desktop notifications if active and possible.
class.remote_fsAccessDriver.php: Fix some option loading error while using the function Ajxp_PLUGIN::init(repository, options)
manifest.xml: Disabling the remote_fs driver by default
class.JumploaderProcessor.php:
      - Cross session resume implementation (doesn't work with smb)
      - partitioning now works with FTP
      - upload validation process now working for FTP and FS
previous commit (#69597c9010cb41b77b2e76cc2aae5b46a6eb9e57) broke the ability to upload folder tree on FS now fixed
We can now use jumploader with SMB, SFTP, FS and FTP drivers
Add the property "PORT" for the sftp repository creation (could not log with the wrong port number)
Merge branch 'master' of https://github.com/ajaxplorer/ajaxplorer-core
now getting the file "jumploader_z.jar" and putting it into the plugin folder
can now upload mutliple files through jumploader with FTP
can now upload multiple files through Jumploader on a FTP repository
Merge remote-tracking branch 'origin/master'
Translated every single "en.php" file (into Portuguese (Portugal)) found in the plugins directory, copying the "en.php" and changing the copies name to "pt.php" plus 3 new flags in the ".gif" format and the ".png" image saying "Drop files here". Hope this is useful!
Fixed a few typos in the translations
Fixed a few typos in the translations
Always rtrim() groupPath from /, if not /. Close #251
Optimization: getRepositoriesList was called inside foreach loop!
Merge pull request #240 from echampet/xaccel

Add X-Accel-Redirect support for Nginx (a sibiling of X-Sendfile).
Replace dirname() by forwardSlashDirname() when manipulating groupPath to avoid errors on Windows.
Merge pull request #248 from BlackLionPT/master

Full Translation to Portuguese (Portugal)