[RFC][icedtea-web]: DownloadService implementation

[Saad Mohammad]

Hello,

I found a little bug while writing the reproducer for this implementation. I
have fixed this issue and attached the updated patch with a Changelog entry
(sorry, I somehow missed adding the Changelog entry in the previous email).

Thanks.

Changelog:

2012-09-07  Saad Mohammad  <smohammad at redhat.com>

	Core implementation of DownloadService.
	* netx/net/sourceforge/jnlp/cache/CacheUtil.java (getCacheParentDirectory):
	Returns the parent directory of the cached resource.
	* netx/net/sourceforge/jnlp/runtime/JNLPClassLoader.java:
	(addNewJar): Adds a new jar to the classloader with specified
	UpdatePolicy.
	(getLoaderByJnlpUrl): Returns the classloader of the jnlp file
	specified.
	(getLoaderByResourceUrl): Returns the classloader that contains the
	specified jar.
	(getJars): Returns jars from the JNLP file with the specified
	partname.
	(removeCachedJars): Removes jar from cache.
	(removeJars): Help removeCachedJars() remove jars from the
	filesystem.
	(downloadJars): Downloads jars identified by part name.
	(initializeNewJarDownload): Downloads and initializes jars into the
	current loader.
	(manageExternalJars): Manages jars that are not mentioned in the
	JNLP file.
	(loadExternalResouceToCache): Used by DownloadService to download
	and initalize resources that are not mentioned in the jnlp file.
	(removeExternalCachedResource): Used by DownloadService to remove
	resources from cache that are not mentioned in the jnlp file.
	(isExternalResourceCached): Determines if the resource that is not
	mentioned in the jnlp file is cached and returns a boolean with the
	result.
	* netx/net/sourceforge/jnlp/services/XDownloadService.java:
	Core implementation of DownloadService.


-- 
Cheers,
Saad Mohammad
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