Removing stripslashes.
Adding mathjax v2.2 see #5231
Adding mathjax support see #5231

No configuration is needed in order to use it (an option will be
added).
Only available in the document tool and can be view using the
document/showinframes.php script.
Adding DropBoxDriver (chamilo dropbox) see #5749
Merge branch 'master' of github.com:chamilo/chamilo-lms