Update icons.html
Update icons.html

'is-active' is not working, in http://ionicframework.com/docs/v2/api/components/icon/Icon/ shows using 'isActive' instead.
driftyco/ionic-site,ionic-team/ionic-site,ionic-team/ionic-site,driftyco/ionic-site,driftyco/ionic-site,driftyco/ionic-site,ionic-team/ionic-site,ionic-team/ionic-site,driftyco/ionic-site