Fixes Wisembly#68 : Added a sleep time after a message is sent

Silent any errors on the file_get_contents on Socket.io Version0X

Add a note on how to have a basic knowledge for making it work

Refs Wisembly#18 : split the packet in case of its length > 16kb

Merge pull request Wisembly#55 from Taluu/refacto-3.0

Refacto 3.0

Merge pull request Wisembly#51 from Taluu/fix-curl-verif

Fix curl's version verification

- updated a bit README and example.

- updated composer.json [ci skip]

- added Changelog file. Added phpunit suite. Added Travis

New Elephant.io from hybi-16