Dronestore

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* tests: added dstype test.
* Bugfix: bypass dstype inheritance
* renamed dupe_keys -> attr_names (clarity)

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* Bugfix: removed broken _unnamed_dstype attr.

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* TimeAttribute and DateTimeAttribute now store serialized data.
* attributes can now store serialized data

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* Changed name `Drone` to the more descriptive `Repo`.
WARNING: this deprecates `Drone`.
* Bugfix: bottledronestore ignored keyword arg.


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* Model: added classproperty functionality to key.
* Removed +x on test_model, as nosetests seems to dislike it.
* Fixed test_model errors.
* Added initializers to test_cases.

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WARNING: backwards incompatible

* Replaced internal ``datastore`` package with the standalone
[datastore](https://github.com/jbenet/datastore) project.
* Changed Key structure to conform to that in ``datastore``. Namely ``/parent/type/name`` turned into ``/type:name``.

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