[upload] accept multi-file uploads on /$upload
[upload] fixes
[upload] use async
Avoid hard-coding the path separator (/).
Updated / expanded future ideas.
Package update + `path` parser.

The `path` parser / escaper is used to make it easy to solve issues related to
issue #38.
Leafs → leaves
make load: autocreate web/ and meta/.
Plugs: include time information for folder's files.
Upstream update.

Includes a change in Camp which allows certain unicode paths to fly.
type: Add type for ogg and mp3.
Use the metadata type for the internal type.

Upon loading the file.
Type: find file types from metadata.
License: AGPLv3.

Reason: http://www.gnu.org/licenses/why-affero-gpl.html
File type system as sets.

Which MIME type is which driver is found in a "drivers: MIME → driver" key in
the metadata.