Adds tag support to the `aws_dynamodb_table` resource. Also adds a test for the resource, and a test to ensure that the tags are populated correctly from a resource import.
```
$ make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSDynamoDBTable_tags'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/02/01 15:35:00 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSDynamoDBTable_tags -timeout 120m
=== RUN TestAccAWSDynamoDBTable_tags
--- PASS: TestAccAWSDynamoDBTable_tags (28.69s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 28.713s
```
```
$ make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSDynamoDbTable_importTags'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/02/01 15:39:49 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSDynamoDbTable_importTags -timeout 120m
=== RUN TestAccAWSDynamoDbTable_importTags
--- PASS: TestAccAWSDynamoDbTable_importTags (30.62s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 30.645s
```
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