added support for 'vundle'-based loading/initialisation

 * .gitmodules: added 'vundle' submodule;
 * plugin/evlib_fwd.vim: fixed path for '/evlib_loader.vim';
 * test/common.vim:
  * added g:evlib_test_common_test_testtrees_rootdir;
  * added function EVLibTest_Gen_InfoMsg();
  * function EVLibTest_Gen_InfoVarValue();
 * test/test_trees/vundle.01/bundle/vim.evlib: symlink to project root
    directory;
 * test/test_trees/vundle.01/bundle/vundle: gitlink (through 'git
    submodule');
 * test/vimrc_02_init_vundle-local.vim: new test for vundle support;