[rfc][icedtea-web] Fix for PR1011, folders in archive tag

[Adam Domurad]

This resolves http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=1011
Entries in the archive tag can potentially be folders. This removes the
assumption that everything in the archive tag is a jar, and adds folders
to the code-base.
This brings the icedtea-web plugin closer to how the proprietary plugin
functions. 

Also attached is a small bit of refactoring to PluginBridge, for
approval.

(Note that the proprietary plugin also ignores invalid jar files in
archive tags - I have another patch awaiting review "Re:
[rfc][icedtea-web] Ignore invalid .jar files in applets" that provides
this behaviour.)

Changelog:
2012-05-29  Adam Domurad  <adomurad at redhat.com>

	Allow for folders in archive tag.	
	* netx/net/sourceforge/jnlp/PluginBridge.java:
	(PluginBridge) Changes jar -> archive, parse contents with
	addArchiveEntries.
	(addArchiveEntries) New method. Adds entries ending with / to the list
	of folders.
	(getCodeBaseFolders) Returns the folders collected by addArchiveEntries
	* netx/net/sourceforge/jnlp/runtime/JNLPClassLoader.java:
	(initializeResources) If ran as plugin, add archive tag folders to the
	code base loader.
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