Add Event Reference Testing

Created new tester.html document

Tested calling ‘this’ (referencing an object assigned within the
module) from an external function
Changed Public Variable Names

Replaced ‘export’ with ‘collate’

Replaced ‘event’ with ‘clicked’
Added New Configuration Options

New configuration options:

* load_scripts (true, define whether or not Google Maps API script is
loaded by the module)
* metric (true, whether or not to use the metric system)
* autoload (false, whether the grid automatically loads when module
initialised)
Add Google Maps API Script Autoload

Added functionality to autoload the Google Maps API (v3) when the
module is initialised
Renamed module

Dropped the camel case. GridMaker is now, simply, Gridmaker.