Fixed, it throwed an error if paperclip styles were declared in a different way.

it gave an error if styles were declared this way (which is not the way paperclip.rb expect)
has_mongoid_attached_file :attachment, :styles => {
                                                      :small        => {:geometry => "75x75>"},
                                                      :medium       => {:geometry => "150x150>"},
                                                      :gallery_size => {:geometry => "940x373"},
                                                      :masonry_size => {:geometry => "220x145"},
                                                      :thumbnail_size => {:geometry => "240x240>", :processors => [:jcropper]}
                                                    }

So, added another check for dimensions.