FC-23 Use SQS visibility timeout of 5 minutes instead of 30 seconds

SQS queues are created such that messages have a visibility timeout of 5 minutes. This gives message handlers up to 5 minutes to process each message, instead of the default 30 seconds. Existing queues are not affected.

Signed-off-by: Steffan Westcott <steffan.westcott@clicktravel.com>
Merge pull request #3 from clicktravel-steffan/master

FC-23 Use SQS visibility timeout of 5 minutes instead of 30 seconds