Sqs.Core: add comments to constructors of MessageAttribute
Sqs.Core: derive some standard type classes for some types
Sqs.Commands.Message: reimplementation with support for SQS version 2012-11-05 features
add test suite for SQS
Better error handling for S3 HEAD requests.

Improve the error handling for S3 HEAD requests, e.g. to allow cleanly identifying 404s, which is the most common expected error con

200       = Just parse metadata
404       = Nothing
otherwise = StatusCodeException
Add security token to SES requests, if present.
Fixed typo in message
add poOtherHeaders

For use with eg, the Internet Archive S3 interface.

Also example program which created https://archive.org/details/joeyh-test

Closes https://github.com/aristidb/aws/issues/119
switch to poAutoMakeBucket

Maxwell worried that allowing arbitrary nonstandard headers could cause
silent data loss if they were sent to a S3 endpoint that did not support
them. This avoids that problem, by only supporting the IA's
x-amz-auto-make-bucket header. If a server ignores that header, no data is
lost, although of course trying to PutObject into a bucket that does not
exist will fail.
updated example to use poAutoMakeBucket
Merge pull request #117 from romanb/ses-security-token

Add security token to SES requests, if present.
start 0.9.3 release notes
update release notes
bump version
Merge pull request #116 from maxpow4h/patch-2

Fixed typo in message
Merge pull request #115 from romanb/s3-head-object-errors

Better error handling for S3 HEAD requests.
Merge branch 'master' of github.com:aristidb/aws
Merge pull request #113 from alephcloud/SQS-2012-11-05

Update of SQS to API version 2012-11-05
Merge pull request #120 from joeyh/master

add poOtherHeaders
when releasing, this will be 0.10, not 0.9.x