changed version: 1.2.0-SNAPSHOT
add "_key" property in DocumentEntity
Fix testcase, Collection returns CollectionName instead of CollectionId.
upgrade junit library to 4.11 from 4.10
Fix testcase, Collection returns CollectionName instead of CollectionId.
test for 1.2.beta3
Add support InMemory Collection.
Rename getter method of isSystem,isVolatile.
debug logging PUT/POST body.
Add support: create collection with createOptions parameter.