Pyramid-mongokit

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* Add register decorator to register documents to mongokit and generate indexes
when doing a config.scan.
* Add an introspectable for each registered document.

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* Add name when registring utility to zope registry to be compatible with
zope.interface==4.1.0

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* Use MongoReplicaSetClient when specified by mongo uri.
* Mongo Session lazily opened.
* Add config directives to register and index documents and to get mongo
connection.

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* Read preference set to secondary preferred by default at construct time.

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* Break compatibility with 0.0.4 as ``register_document`` does not generate
indexes anymore.
* Add ``generate_index`` function.
* Break apart Connection classes: ``MongoConnection`` is not anymore tied to a
single databases and ``SingleDbCOnnection`` is tied to a single database.
* Add an example used for documenting and functional testing.

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* registering document ensures index are created.