fix cast to float array when reading img with PIL
fix cast to float array when reading img with PIL

kashefy/nideep,nigroup/nideep,kashefy/caffe_sandbox,nigroup/nideep,nigroup/nideep,kashefy/nideep,kashefy/caffe_sandbox,kashefy/caffe_sandbox,tsingjinyun/caffe_sandbox,kashefy/nideep