Aggregator should support override URLs for non-aggregated resources

[chuckdumont]

See Override URIs. For non-aggregated resources provided using the resource-id servlet init-param, override URIs could be supported in one of the following ways:

• By matching the URI specified by the resource-id:base-name init-param against the primary URIs specified in the baseUrl, paths and packages properties of the Server-side AMD config file and using the corresponding override URI for matching resources.
• By adding support for a resource-id:override-name init-param
• Both of the above.