Gut `metastore`, rename to `views`

[Jason Gerard DeRose]

`metastore.MetaStore` ended up being an ill conceived wrapper around the desktopcouch wrapper around the python-couchdb wrapper. But as I learn the CouchDB API better, I consistently want less wrapper, more REST.

However, `metastore` does have some handy stuff for defining views and building design docs, so we should keep this. So the plan is to gut everything except the view related stuff, then rename the module to `views`.

Also, although somewhat out of scope for this bug, we need to minimize when we generate the design docs and check if they match what is currently in CouchDB (actually, this brings out the downside of syncing views for something like desktopcouch). Normally this should happen at most once per session when dmedia-service first starts... right now it's happening every time you launch dmedia-gtk, which is "not a good thing".

[Jason Gerard DeRose (jderose)]

Ended up making much more sense to do this along with:

  Add new core API/entry-point sans import functionality - https://bugs.launchpad.net/dmedia/+bug/753260

and

  Split into simpler, more MAC friendly services - https://bugs.launchpad.net/dmedia/+bug/724707

This feature is complete and you can see the new lean `views` module here:

  http://bazaar.launchpad.net/~jderose/dmedia/core-api/view/head:/dmedia/views.py

This will be merged to trunk together with lp:753260 and lp:724707