Merge pull request #62 from chamilo/1.9.x

1.9.x
Add Wodo Text editor sample  -refs BT#8274
Add version name for 1.9.8.3
Merge branch '1.9.x' of github.com:chamilo/chamilo-lms into 1.9.x
Add ViewerJS  -refs BT#8274
Implement ViewerJS  in showinframes.php -refs BT#8274
Install just allowed plugins in the course - refs #7222
Merge pull request #328 from FraGoTe/7222

7222
Merge branch '1.9.x' of github.com:chamilo/chamilo-lms into 1.9.x
update rapid installation documentation - refs BT#8441
update rapid installation documentation Spanish - refs BT#8441
update rapid installation documentation Spanish - refs BT#8441
update rapid installation documentation Spanish - refs BT#8441
Add changelog and readme to bbb plugin to indicate table structure change for sessions
Merge branch '8274' of https://github.com/danbarretodev/chamilo-lms into 1.9.x
Adding Expiry date to user import functionality -refs #6839
Adding Expiry date to user import functionality -refs #6839
Adding hide_scorm_export_link configuration option see BT#8459
Merge branch '1.9.x' of ssh://github.com/chamilo/chamilo-lms into chamilo19
Minor - updating description.