Fix learning path teacher/student view. Issue #6604
Minor - format code.
Using Display::return_icon + removing SQMSESSID calls.
Use Display::return_icon
Replacing <img> with WEB_IMG_PATH and Display::return_icon see BT#6903
Replacing <img> with WEB_IMG_PATH and Display::return_icon see BT#6903
Moving img files into web/ see #6903
Removing unused files.
Improving advanced_settings element in order to hide/show a desired div.
Removing base_chamilo.css see #6980
Updating vendors
Removing bxslider, using bootstrap carusel.
Minor - Updating  bootstrap 3.1.1
Moving default.css at the end of al CSS calls see #6947
Improving actions UI.
Fixing plugin fatal error.
Fixing user paths.
Hiding categories with out LPs see BT#7558
Hiding LP category only for the first one. see BT#7558
Minor - Removing whitespace.