fix for issue #25

Error with creation subfolders happen, because when clients calculate canonical string it's use '/' for separate parts of object name, but when swift3 calculate canonical string '/' in object name quoted (replaced with %2F). That is why swift3 calculated canonical string and client's canonical string are not equal and Swift autorization middleware (for example tempauth) returns HTTP 403 response.
Also in this patch I add support for GET parameters with values.