fix #221 q-icon must be used for icon only buttons
fix #221 q-icon must be used for icon only buttons

rstoenescu/quasar-site,quasarframework/quasar-framework.org,rstoenescu/quasar-site,quasarframework/quasar-framework.org,quasarframework/quasar-framework.org,rstoenescu/quasar-site