Specify exact Python version to 2.7
Set the minimum coverage to 45%
Fix unnecessary fixture reloading
 #18 basic upload support
#18 refactor to support multiple files
#18 basic serving support
 #18 store files in a per-case folder and do security checks
 #18 add additional folder in case we upload things besides cases
#19 initial migration for refugee_manager
#19 add address field to Volunteer