Require datom fragments to have a value, but let it be nil.
Rename doc/schema to doc/examples.
Flesh out byte-sequence schema into full doc.
Flesh out filesystem schema into full doc.
Move collections doc into schemas.
Rename data-structures doc.
Merge entity examples into doc file.
Remove signature examples.
Remove static set example.
Move rest-service and TODO into dev/notes.
Move examples into dev/notes.
Add note about camlistore blob indexing.
Merge branch 'doc-updates' into develop