Moved the aws-sdk-core gem code from lib/aws to lib/aws-sdk-core.
Moved the aws-sdk-resources gem code from lib/aws to lib/aws-sdk-resources.
Removed the SRC path constant, now using the gem name in autoloads.
Flattened an extra directory from aws-sdk-resource lib path.

Also moved unit tests to matching locations.
Fixed a few documentation issues with the restructuring of gem files.
Merge pull request #115 from aws/gem-folders

Gem lib folders