Merge pull request #10 from nefilim/master

Add support for supplied AwsCredentialsProvider
Fix compilation error, support of PATCH method.
Correctly marshall request attributes and metadata when puting a object with AWS-S3
Merge pull request #12 from nremond/s3-marshalling

Fix compilation error, support of PATCH method. Fixes #11
[DynamoDB]add support to scan request
Merge pull request #13 from mingchuno/master

[DynamoDB]add support to scan request
Merge remote-tracking branch 'upstream/master'