Description of problem:
can't set options/params through the arguments

Version-Release number of selected component (if applicable):
fuse-s3fs-0.7-5.fc15

How reproducible:
always

Steps to Reproduce:
1. don't export env access key/ security key
2. set them using -o
  

Additional info:
the following lines in the code should be fixed

               #Set the env correctly
               if self.AWS_ACCESS_KEY_ID != None:
                       os.putenv("AWS_ACCESS_KEY_ID",self.AWS_ACCESS_KEY_ID)
               if self.AWS_SECRET_ACCESS_KEY != None:
                       os.putenv("AWS_SECRET_ACCESS_KEY",
                               self.AWS_SECRET_ACCESS_KEY)

               if (os.environ.get("AWS_ACCESS_KEY_ID") == None):
                       print "Need to specify AWS_ACCESS_KEY_ID"
               if (os.environ.get("AWS_SECRET_ACCESS_KEY") == None):
                       print "Need to specify AWS_SECRET_ACCESS_KEY"

as python docs says < http://docs.python.org/library/os.html#os.putenv

When putenv() is supported, assignments to items in os.environ are
automatically translated into corresponding calls to putenv();
however, calls to putenv() don’t update os.environ, so it is actually
preferable to assign to items of os.environ.

the code above set's env with putenv then read it with environ
the docs says just set it with environ and it will call putenv

so it should be

               if self.AWS_ACCESS_KEY_ID != None:
                       os.environ["AWS_ACCESS_KEY_ID"]=self.AWS_ACCESS_KEY_ID
               if self.AWS_SECRET_ACCESS_KEY != None: os.environ["AWS_SECRET_ACCESS_KEY"]=self.AWS_SECRET_ACCESS_KEY