Updating bower components:

- bootstrap-social, 4.3.0 => 4.8.0
Adjusting Gruntfile's watch tasks related to LESS/CSS. Broke the :less task out into :less & :css, with the :less task now having no livereload. This is b/c if we create a separate watch task for just *.css files, then livereload will just reload the css files, NOT the entire page.
Re-built the CSS after updating the font-awesome library.