Fix learning path teacher/student view. Issue #6604
Minor - adding docs + adding 1 option for end_button.
Adding onSuccess/onFailed message.
Adding common hide/show code see BT#7060
Adding new code to save a nanogong file.
Updating from 1.9.x
Updating bootstrap 3.1.0
Updating jquery, removing old jquery file.
Removing old code reference.
Adding email notification for students in exercise see BT#7379
Minor - adding missing tpls.
Renaming old function name.
Replacing WEB_LIBRARY_PATH to WEB_LIBRARY_JS_PATH see #6903

The idea is to move the javascript folder inside the web/ChamiloLMS/js
folder that is not parsed by the Silex controller.
Moving javascript files inside a "public" path see #6903
Applying fix see BT#4704
Removing course_code from table access_url_rel_course see #6943
Using Display::return_icon and using WEB_IMG_PATH see #6903

Removing unused CSS code
Using Display::return_icon and using WEB_IMG_PATH see #6903
Moving CSS files into web/ see #6903
Po translations are moved in the src/ChamiloLMS/Resources path.