USE_S3 fix for 'False' == True
USE_S3 fix for 'False' == True

os.getenv() returns a string 'False' by default, so in tasks.py when
app.config['USE_S3'] was used, it would always return True no matter
what

odin1314/sketchy,daannijkamp/sketchy,odin1314/sketchy,daannijkamp/sketchy,Netflix/sketchy,daannijkamp/sketchy,gorcz/sketchy,Netflix/sketchy,Netflix/sketchy,gorcz/sketchy,gorcz/sketchy,odin1314/sketchy