changed with statement to be compatible for python 2.6 and 2.7
changed with statement to be compatible for python 2.6 and 2.7

cianfrocco-lab/cryoem-cloud-tools,cianfrocco-lab/cryoem-cloud-tools,cianfrocco-lab/cryoem-cloud-tools,leschzinerlab/AWS,leschzinerlab/AWS,cianfrocco-lab/cryoem-cloud-tools,cianfrocco-lab/cryoem-cloud-tools,cianfrocco-lab/cryoem-cloud-tools