release 0.9.12

• upgrade jackson to 2.9.7
• remove commons-lang3 dependency
• add status of maven central and java doc
• add binary packer
• add packer for eos transfer
• add local sinature support

release 0.9.11

• #1 holdon new_producers for block detail

release 0.9.10

• reformat the pom dependencies
• release the first version