Update gem yard, yard-tomdoc

loaded gem is no longer exist, so I can not complete bundle install.
```
$ bundle
Fetching gem metadata from http://rubygems.org/..
Could not find loaded-0.0.1 in any of the sources
```

Use command below:
$ bundle update yard yard-tomdoc
Merge pull request #29 from sanemat/feature/bundle-update

Update gem yard, yard-tomdoc