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

Log ALL API errors along with API Key used

Rename $var to $var - for consistency

Add routine to import emailed & api files

Issue/428

Increase the size of varchar fields

Make collation consistent - utf8_general_ci.

Fix input field name typo

Default nonsensical charsets to ASCII.

Support IP forwarding for load balanced instalaltions.

Default SLA

Sanitize user input.

Reviewed-By: Peter Rotich <peter@osticket.com>

Which will allow for a modular approach to command-line scripting of the
osTicket system. Hopefully, it will alleviate the need to copy+paste code
between scripts and otherwise duplicate functionality between locations. It
will also allow for easier administration of osTicket by shipping scripts to
do things like database maintenance, statistics exports (collectd), data
exports, etc.

The first example script include the capability to unpack the osTicket
installation/upgrade tarball to the destination install path with optionally
placing the include folder in a different location. The script will monkey
patch main.inc.php so that the INCLUDE_DIR define will point to the
installed location of the include/ folder.