Alog is a wrapper around aolog, that extends it to allow versioning of the entries, i.e, updatable entries.
This is accomplished by appending entries with update annotations.
_updates: "#39"body: "new body"
Identical to aolog, with two additions:
cb: function (err, res)
Updates entry 'idx' and callbacks with the new log.
Returns a list of all versions of this entry, possibly only one.
For more info, check out the aolog documentation.