Rework query and attribute
table_test: Change table name for ItemSuite with range key

This avoids unknown error from real DynamoDB.

table_test.go:337: Post https://dynamodb.us-east-1.amazonaws.com/: http: Request.ContentLength=127 with Body length 0

Conflicts:
	table_test.go
Merge pull request #25 from nabeken/rework-query

Rework query