Modify to emphasize "Ruby on Rails" display

app/assets/stylesheets/style.css
- Add 'span.rails'.
app/helpers/application_helper.rb
- Modify process_emphasizer() to emphasize string "Ruby on Rails".
Use larger font for link to '{projects,progresses}#index'

app/assets/stylesheets/style.css
- Add 'a.major_link'.
app/views/progresses/index.html.erb
- Add HTML class of 'major_link' to link to 'projects#index'.
app/views/projects/index.html.erb
- Add HTML class of 'major_link' to link to 'progresses#index'.
config/locales/ja.yml
- Alter the value of "helpers.link.project.index".