Merge pull request #19 from billhathaway/master

refactor logic to parse queue's URL when using query, add test case
Merge pull request #21 from billhathaway/TestCreateQueueWithAttributes

make TestCreateQueueWithAttributes deterministic for issues/18
Modify GetQueueAttributes to be variadic, add test
Merge branch 'master' of github.com:billhathaway/goamz