Ruby for NaCl. Please assign the appropriate reviewer.

tests/ruby/README

+1. Change current directory to native_client/tests/ruby
+
+cd install_dir/build/native_client/tests/ruby
+
+2. From native_client/tests/ruby directory:
+
+make nacl download
+
+  It will download Ruby sources and will copy neccessary files from
+  native_client/tests/ruby/appendix to these sources.
+
+3. Build NaCl ruby from native_client/tests/ruby directory:
+
+make nacl debug
+
+or
+
+make nacl release
+
+4. Run golden tests:
+
+make nacl golden
+
+5. Start a webserver from native_client directory using:
+
+/usr/bin/python2.5 tools/httpd.py
+
+6. Goto http://localhost:5103/tests/ruby/ruby.html and wait until
+   "Ruby is loaded" message is appeared. 99% of time it require less
+   than a second to load.
+
+7. Try Ruby queries like:
+
+puts "Hello, world!"
+name = "Joe"
+puts "Hello, #{name}"
+puts 2+3
+10.times { puts "NaCl\n" }
+
+  Not everything works, you should expect some errors.