[rfc][icedtea-web] PR1271, Handle 'javascript:' urls, with tests

[Adam Domurad]

This fixes this bug 
http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=1271

Note the test case sometimes fails if the fix from '[rfc][icedtea-web] 
Fix NPE on Applet launch due to missing AppletStub' is not applied.

ChangeLog:

2013-XX-XX  Adam Domurad  <adomurad at redhat.com>
         * plugin/icedteanp/java/sun/applet/PluginAppletViewer.java: 
Evaluate
         javascript when it shows up in a 'showDocument' call.
         * plugin/icedteanp/java/sun/applet/PluginMain.java: Install 
arbitrary
         'javascript:' protocol handler.
         * 
tests/rproducers/simple/JavascriptURLProtocol/resources/JavascriptProtocol.html:
         Tests if javascript is run from a test applet using showDocument.
         * 
tests/reproducers/simple/JavascriptURLProtocol/resources/JavascriptProtocol.js:
         Same.
         * 
tests/reproducers/simple/JavascriptURLProtocol/srcs/JavascriptProtocol.java:
         Same.
         * 
tests/reproducers/simple/JavascriptURLProtocol/testcases/JavascriptProtocolTest.java:
         Same.

Cheers,
-Adam
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