Merge pull request #9 from danieltardon/development

Development
Merge pull request #10 from danieltardon/development

Development
Merge pull request #12 from danieltardon/development

Development
Merge pull request #13 from danieltardon/development

Development
Merge pull request #14 from danieltardon/development

Fix, by now, unnecesary calls to create listeners.
Fix NoNodeError when there is no consumer Znode in Zookeeper #15