Add Wodo Text editor sample  -refs BT#8274
Add ViewerJS  -refs BT#8274
Implement ViewerJS  in showinframes.php -refs BT#8274
Merge branch '8274' of https://github.com/danbarretodev/chamilo-lms into 1.9.x
Merge branch '1.9.x' of github.com:chamilo/chamilo-lms into 1.9.x
Update soffice documentation