Merge pull request #47 from rs-services/master

Merge pull request #46 from gonzalez/master

gofmt

Adding CostExplorer Service

Update awsauth.go

Replace goconvey with gunit where needed.

Use gunit for common tests.

Merge pull request #31 from danopia/patch-1

Ignoring project files.

Update and rename LICENSE to LICENSE.md

Create CONTRIBUTING.md

AWS ElasticSearch Service uses v4 signing

Merge pull request #27 from derek-burdick/master

gofmt.

Signing does not include port segment in host header if it is 80 or 443