Adding metadata for kan.so - repository

Added kanso.json for direct publishing into
kanso repository with `kanso publish`.
Merge pull request #11 from thriqon/master

Metadata for kan.so - repository
Implement (binary) attachment support

BackbonePouch.attachments is a mixin, which proviedes methods for
storing, retrieving and listing attachments:
* model.attachments(filter)
* model.attach(blob, name, type, callback)
* model.attachment(name, callback)
Update pouchdb-nightly
Merge branch 'master' into gh-pages