First code for rbyaml

Give a update to current status:

1. Mailing List available.
2. Added a tiny Rakefile.
3. Port yaml 45 test cases from CRuby to RbYAML. Running result,

57 tests, 57 assertions, 27 failures, 27 errors.

4. Created some issue/task in googlecode,
1) Clear up warnings.
2) Syck compatible.
3) Make orinigal test be passed.
5. FishEye for rbyaml is on the way.