Merge local change into OpenXava 4.7.1
 1. Use dynamic classloader to make Entity class cnould be load dynamically;
 2. Add some reset method to fit dynamic classloader;
 3. Move all xava jsp/js files into xava folder so module.jsp and build.xml changed;
 4. Fix module.jsp to keep compatibility of multi-web-resource folder in jetty;
 5. Fix module.jsp to disable http cache;
 6. Add string resource in Labels and Messages of zh_CN;