Merge pull request #33 from pyeremenko/v3

Actualizing lib to support v3
Merge pull request #35 from pyeremenko/v3

Some changes related to alerts and subscribers and actualization of Readme
Add replace, remove, add subscribers methods
Update documentation to support push queues
Add tests for replace, remove, add subscribers methods
Fix Remove Subscribers method and remove deprecation
Merge pull request #37 from sunloverz/v3

Fix V3 push queues
Add keystone support
Add keystone to Readme
Add the long polling feature for reserving messages
Update readme, add long polling param
Merge pull request #38 from sunloverz/v3

Add keystone support
add example to clarify new behavior of touch method