XMLSerializer::elementValue() handling of bools.

* Bool values return string of "true" or "false".
Adding & Processing GetSummaries_00 example.
Adding ResolveGameID examples.
XMLSerializer::toSingular(): Added "result" case
ISteamHub::ResolveVanityURL Content Changes

* Renamed example files.
* Added new fields.
* Changed result structure.
* Updated documentation.