[ruby-dev:32250]

* parse.y: remove NEED_ASSOC that break test_parser_events.

* parse.y (parser_yylex): should not decrement line numbers at the
  end of file.

* file.c (rb_find_file_ext): search .rb files first through in the
  loadpath.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13966 b2dd03c8-39d4-4d8f-98ff-823fe69b080e