Adding US West 2

Conflicts:
	Aws/Sqs/Core.hs
Merge remote-tracking branch 'aristid/master' into am
Merge pull request #58 from alphaHeavy/master

Added support US-West2
conduit 1.0 support
Merge pull request #60 from snoyberg/master

conduit 1.0 support
http-conduit 1.9.0
Merge github.com:fpco/aws
Merge pull request #61 from fpco/master

http-conduit 1.9 support
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