Added getGuid() method to file model
Added getGuid() method to file model

CenterForOpenScience/ember-osf,baylee-d/ember-osf,binoculars/ember-osf,baylee-d/ember-osf,jamescdavis/ember-osf,CenterForOpenScience/ember-osf,binoculars/ember-osf,jamescdavis/ember-osf