Ndserviceregistry

* Removed untested PyPY support from the Travis CI test framework.
* 49: Do not set ACLs on recursively created paths.
* 39: Completely remove get_data() calls from the children of watched paths.
* 48: Fix compatibility with Kazoo 2.0

* Bugfix: Ensure Kazoo is between 1.3 and 2.0.

* Bugfix: Remove *nose* requirement from the setup.py.

* 45: Prevent duplicat callback executions when data has not changed
* 39: Reduce the number of Zookeeper get() calls made by the Watcher objects
* 38: Ensure that an non-existent path will get a Child Watch when available
* 37: Fix DummyWatcher behavior when no local cache data is available
* 36: Add a get_state() method to KazooServiceRegistry
* 35: Prevent caching of nodes where *data* and *stat* are None
* 28: Provide normal *directory style* format for ndsr output
* 27: Disable Rate Limiting of Zookeeper calls in the CLI *ndsr* tool
* 25: Add DataNode object type and appropriate set_data() methods
* 15: Implemented initial Unit and Integration tests
* 14/24: Add in a CLI Management Command *ndsr* for interacting with Zookeeper data
* Testing: Integrated Travis CI testing
* Add contrib.django.utils package for easy Django/Zookeeper integration

* Fix Registration.registration again - set the *ephemeral* setting at construction time.

* Fix Registration.registration - set _ephemeral = False in __init__.