Need to account for `reopen` and `@for`

The underlying issue is that ember-jsonapi-docs do not account for the use of reopen and @for in source documentation.

The fix is likely to be very similar to the one for uses here:

Lines 42 to 44 in d8c217d

    
           if (klass.uses && klass.uses.length) { 
        
             parents = parents.concat(klass.uses.reverse()) 
        
           }

@for still works. We just need to change it back from @for ControllerMixin to @for Ember.ControllerMixin

	if (klass.uses && klass.uses.length) {
	parents = parents.concat(klass.uses.reverse())
	}