Upgraded from Ionic v0.9.20-alpha to use the libraries (ionic, angular, angularfire) from Ionic v0.9.27. Also switch to use ion- directives to comply with breaking change from Ionic v0.9.25.
To comply with a breaking change from Ionic v0.9.27,  modified the ion-header-bar title attribute from title="myTitleVar" to title="{{myTitleVar}}".  Although this wasn't mentioned in the Ionic changelog, I also found it was necessary to change the title attribute of the ion-view directives in Ionic-seed in the same way.
To comply with a breaking change from Ionic v0.9.27,  modified ion-content to use ion-refresher, and got rid of the old refresh-complete attribute.