adding AWS SDK for PHP 2.4.0
adding several new parameters
reworking and extending \OC\Files\Storage\AmazonS3
reworking testclass for \OC\Files\Storage\AmazonS3
added commented new parameters
increasing difference for modifcation time tests

one second is sometimes not enough when using a slow storage connection,
three seconds is working better (at least when testing against S3)
test copying and moving files in subdirectories
test working with subdirectories
test working with files in subdirectories
fixing rmdir in \OC\Files\Storage\AmazonS3
move new tests into the correct test method
test moving and copying of subdirectories
remove tests from the wrong test method
use us-west-1 as default region for Amazon S3
revoking additional tests
removed aws.phar and added extracted zip instead
replaced substr with trim
remove needless check
fixed syntax error
check if used bucket name is valid