fixed indentation
adapted to mention the possibility to suppy a object already containing
users instead of a path to the json-file containing users
minor fixes where doumentation hasn't been correct
also mention -m switch pointing to the package-directory
and mention rp
made users-file reloadable and added check to saveUsers if file is
actually a filepath or just an object containing users
fixed typo, slightly changed wording
removed superfluous semicolon
fixed bug causing users-file to be reloaded every time
made jsonusermanager emit events if users are reloaded
print out a message in example main.js if users.json-file has been
reloaded
Merge branch 'master' of https://github.com/kmfdm1/ringo-ftpserver into kmfdm1-master
fixed link to apache ftpserver project
split jsonusermanager module into two separate ones:

 * usermanager operates on an object containing the user accounts
 * jsonusermanager extends usermanager and operates on a JSON file

added unit tests for both of them, and updated api docs
use EventAdapter to execute ftpserver's callbacks

By using EventAdapter we make sure that all callbacks are executed
in the queue of the worker which bound those callbacks.