Support SVG Font Awesome icon in main sidebar
Support SVG Font Awesome icon in main sidebar

This commits adds support for SVG Font Awesome icon within the main
sidebar. Font Awesome translate i tags to svg tags, resulting in the
angle icon not rotating in the sidebar.

Fixes #3532

oyjt/AdminLTE,oyjt/AdminLTE,almasaeed2010/AdminLTE,garrettwong/AdminLTE,almasaeed2010/AdminLTE,slachiewicz/AdminLTE,slachiewicz/AdminLTE,oyjt/AdminLTE,garrettwong/AdminLTE