added the option to set the container as an optional parameter in some methods, added unit test for this, updated readme file
modified readme file
[fixes: #1] I believe that by removing the  ugly include from Cloud Files Driver will take care of issue "Cannot redeclare class cf_authentication". Also  the latest version of omissis/php-cloudfiles seem to address a known bug: Also see
https://github.com/rackspace/php-cloudfiles/issues/82
and
https://github.com/omissis/php-cloudfiles/pull/1

Added a test group to run each test individually: storage_cf and storage_s3
Merge pull request #1 from alleluu/master

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