Initial commit. This adds the following elements:
 - ol2-map: The OpenLayers viewer
 - ol2-layer: An OpenLayers.Layer subclass to add. Constructor must be of the type (name, options)
 - ol2-grid-layer: An OpenLayers.Layer.Grid subclass to add. Constructor must be of the type (name, url, options)
 - ol2-options: Defines a collection of ol2-option elements. A type must be specified to hint what type of options this applies for.
 - ol2-option: Defines a key/value pair.