Some formatting in Aws.Core - hope nobody minds
SignedQuery should respect explicity body and content-type choices

A PostQuery used to override any explicityly given Body and
Content-Type choices in the SignedQuery. I belive this is to be
erroneous, as it simply overrode explicit selections due to a
PostQuery, which is particularly impossible to deal with when
implementing AWS version 4 signing.

It now enforces the PostQuery defaults *only* if the explicit
selections are missing.
The first operational building blocks of a DynamoDB implementation
Add PutItem for DynamoDB + better type conversion
Improve documentation of this first iteration of DynamoDB functionality
Merge remote-tracking branch 'refs/remotes/aristidb/master'
Get everything working again
Add DynamoDB UpdateItem command
added instance meta-data creds query
switched creds check order
Switched from assoc list to map

Fix decoding error
added iamTokens
added iam tokens to s3
made Owner in s3 optional
check if instance metadata available

To speed up credential fetching.
fixed timeout
corrected network comment
Merge DynamoDb parts with upstream work

Merge remote-tracking branch 'refs/remotes/aristidb/master'

Conflicts:
	Aws/Core.hs
	Aws/DynamoDb/Commands.hs
	Aws/DynamoDb/Core.hs
	aws.cabal
More DynamoDb work and get DynamoDb example working
Upgrade conditionals to latest API