[rfc][icedtea-web] Java -> Javascript object leak tests

[Adam Domurad]

Final patch of my internship :-)
I've tested this one pretty thoroughly, hopefully it is suitable.
To test it, apply the two previous patches (the test + test fixes). The 
unit tests and reproducer should then pass.

Here are the fixes:

ChangLog:
2013-XX-XX  Adam Domurad  <adomurad at redhat.com>

         * plugin/icedteanp/IcedTeaJavaRequestProcessor.cc: Fix Java object
         reference leaks in many methods.
         * plugin/icedteanp/IcedTeaPluginRequestProcessor.cc: Same.
         * plugin/icedteanp/IcedTeaJavaRequestProcessor.h
         (NPObjectRef): Force explicit construction.
         (object_map): Make NPObject references 'weak'.
         * plugin/icedteanp/IcedTeaPluginUtils.cc: Update object_map 
usage for
         new 'weak' references.
         * plugin/icedteanp/IcedTeaPluginUtils.h: Same.
         * plugin/icedteanp/IcedTeaScriptablePluginObject.cc: Minor cleanup,
         fix accidental retain caused by implicit NPObjectRef construction.
         * plugin/icedteanp/IcedTeaScriptablePluginObject.h: Free Java 
object
         references on deallocation.
         * plugin/icedteanp/java/sun/applet/PluginAppletSecurityContext.java
         (handleMessage): Don't create a new object reference when passed an
         existing object.
         (store): Now returns reference.
         (freeIdentifier): New, convenience method for freeing identifier.
         * plugin/icedteanp/java/sun/applet/PluginAppletViewer.java:
         (call): Cleanup, fix Java string reference leak

Cheers & bye for now,
-Adam
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