Translate bundleresource urls to file system paths

[xsuchy]

org.eclipse.cdt.internal.core.pdom.dom.cpp.PDOMCPPLinkage.getNode   bundleresource://602.fwk1957030593/org/eclipse/cdt/internal/core/pdom/dom/cpp/PDOMCPPLinkage.class  PDOMCPPLinkage.java     

https://abrt.fedoraproject.org/faf/reports/380913/

http://help.eclipse.org/indigo/index.jsp?topic=%2Forg.eclipse.platform.doc.isv%2Freference%2Fapi%2Forg%2Feclipse%2Fcore%2Fruntime%2FFileLocator.html

File classFile = new File(FileLocator.toFileURL(classURL).getPath());

Originally reported as jfilak/abrt-java-connector#40