Work in progress: let the local document collection be able to use different cache implementations.
Added EhCacheDocumentCache. Changed SemanticsGlobalScope to enable switching document cache implementation.
Renamed NewDownloadController to DownloadController as the old controller fades away. Fixed NPE in DocumentParser.
Fixed bug with DefaultHTMLDOMParser not doing xpath extraction. Made Document.metaMetadata set to the right one after constructing from a non-type metadata. Updated simplCore for handling unicode correctly.
Set status before returning from DocumentClosure.performDownload(). Updated simplCore.jar.
Various fixes according to service logs.