Handle digest values of string or buffer

In nodejs 0.8.x, hash.digest() returns a string. In 0.10.x, it returns
a Buffer.

output.write() was throwing a type error when a buffer was provided.
I've put in some switcheroo code that checks the type of the digest
and uses the correct buffer-writing code.
Remove older comment
Use full syntax for setImmediate()
Add image.url to list of expected indices
More forgiving handling of unknown targets in activities
Better notice for login web ui test
Command-line script to post a file
Add another endpoint for plugins
Group inbox gets all finishers
Add scripts to layout
Add scripts from a plugin
Merge branch 'master' of github.com:e14n/pump.io
Add feeds when there's not a remote object URL
Fixup whitespace in update-object-test
Update test works
Update person-get-inbox-test-as-root
Move authz methods to library
Merge remote-tracking branch 'upstream/master'