Added the ability to specify region for bucket creation and standardized the ACL for keys

Not all S3 regions are equal. I have added the ability to specify the region in which a bucket is created. 

Boto declares internally which region strings are support so see your boto installations documentation for more information. 

I have also standardized the ACL's for new keys back to Private. This is in line with what the ACL is set to on uploaded keys through Amazon tools.