Ignore bundler artifacts.
Use consistent style for code snippets.

- Favor `RSpec.describe` for outer describe.
- Remove unneeded blank lines (it made the page
  longer than it needed to be).
- "for an all gutter game" reads better.
Fix typo: Gitub -> Github
Expand history.
Clean up `link_to` code using string interpolation.

Also, added a release date for RSpec 3.
Update the example spec for the home page.

The old spec was more specific (an all zero game)
then the implementation (which summed all the pins).
Given we didn’t want to do the “simplest” thing and hard
code a return value of 0, it’s better to have a spec
that actually forces the summing of the pins.
Reformat paragraph.
Clarify that @dchelimsky took over in 2006.
Merge pull request #19 from rspec/initial-myron-changes

Misc changes from Myron