upgrade ember-cli-app-version to remove some warning messages
upgrade ember-cli-app-version to remove some warning messages

thefrontside/emberx-select,knownasilya/emberx-select,martypenner/emberx-select,arenoir/emberx-select,knownasilya/emberx-select,gte451f/emberx-select,steveklabnik/emberx-select,tejasmanohar/emberx-select,arenoir/emberx-select,martypenner/emberx-select,thefrontside/emberx-select,jeffreybiles/emberx-select,jeffreybiles/emberx-select,tejasmanohar/emberx-select,steveklabnik/emberx-select,gte451f/emberx-select