Partial commit with Netty 4.1
License
Fix version
Fix style and issues as in 2.4.30
Fix Version
fix
Fix POM
Merge pull request #15 from fredericBregier/wNetty41

Fix POM
Last fix and version
Merge pull request #16 from fredericBregier/wNetty41

Last fix and version
Fix doc
Merge pull request #18 from fredericBregier/wNetty41

Fix doc
Fix close
Merge pull request #19 from fredericBregier/wNetty41

Fix close