add rat_exclude file that contains patterns RAT should ignore

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@980165 13f79535-47bb-0310-9956-ffa450edef68

rat_exclude

@@ -0,0 +1,34 @@
+.gitignore
+CHANGES
+CONTRIBUTORS
+autoscan.log
+config.guess
+config.log
+config.status
+config.sub
+configure
+configure.scan
+depcomp
+install-sh
+libtool
+ltmain.sh
+missing
+stamp-h1
+ylwrap
+*.m4
+autom4te.cache
+thrifty.h
+version.h
+version.h.in
+md5.c
+md5.h
+doc
+lib/erl/vsn.mk
+/lib/erl/build/**/*
+lib/erl/src/Makefile
+thrift.appup.src
+OCamlMakefile
+README-OCamlMakefile
+TODO
+Manifest
+setup.rb