fix expressions like {{background-default}}
fix expressions like {{background-default}}

xomaczar/ember-paper,miguelcobain/ember-paper,bjornharrtell/ember-paper,cogniteev/ember-paper,bjornharrtell/ember-paper,bjornharrtell/ember-paper,cogniteev/ember-paper,miguelcobain/ember-paper,miguelcobain/ember-paper,xomaczar/ember-paper,cogniteev/ember-paper,xomaczar/ember-paper