DISABLE_SESSION define is changed so that existing session are continued
but new sessions are not saved. This allows external auth backends to
redirect to an external site and that site redirect back to a `/api` URL and
the user's session will be continued.

Fix PHP NOTICE level errors for cron jobs executed from the command line

Fixes #4

Disable DB session storage. This chews up database space and processing time
for a request that will never resume the same session (given the current API
model anyway).

Change /api/task/* -> /api/tasks/*

Implement remote cron as api task (more to come)

 - local piping must use api/pipe.php
 - API Key is not required - bypasses TicketApiController::create
 - Overwrites ApiController's response method -  postfix exit codes are used as opposed to http codes

Add special case and helper method to process emails

Before it required an edit for osTicket installations made to a folder other
than the root of a domain or subdomain. Now, the installation path is
autodetected and rewritted.

Also, don't assume that every Apache installation has mod_rewrite support.

There are no symlinks in the api/ folder or subfolder

The API is implemented for HTTP requests via the api/http.php module.  Where
supported (by Apache), support rewriting URIs from something like
http://domain.tld/api/tickets.xml to
http://domain.tld/api/http.php/tickets.xml, so the explicit usage of the
http.php script is not required.