also, added a test for .ack()

* add SelectListener

* add SelectListener

* test out select listener

* fix tests

* fix tests

* fix tests

* fix tests

* fix tests

* refactor

* refactor

* more secure registering in epoll listener

* more secure registering in epoll listener, v1.1.1

* reduced timeout for select listener

* refactor

* refactor

* refactor

* got rid of monotonic dependency for Python 3.x

* instantiate listener_class

* daemonize the thread in constructor

* daemonize the thread in constructor

* refactor

* refactor

* refactor

* refactor

* more refactor

* more refactor

* more refactor

* more refactor

* don't overwrite client data

* run these tests verbose

* run these tests verbose

* ImportError fix

* fix tests for monotonic