Corrected non-ascii bytes

This afternoon I got errors when attempting to use the files due to non-ascii characters on a MacBook Pro with OS X 10.8.5.  After I installed the Ruby gems with bundler and corrected the missing ruby gems in the build process, I then attacked the non-ascii characters.

I removed non-ascii bytes from this set of files.
Please review the proper behavior was performed visually and semantically before accepting.

Regards,
George Wood

Here is an example error that occurred before I was able to generate the files properly:
```
gwwood-mac{532} 2014-04-28T19-14-17-0700 ~/src/training-kit $ ./_buildscripts/cibuild
ruby 2.1.1p76 (2014-02-24 revision 45161) [x86_64-darwin12.0]
hostname: gwwood-mac.local
pwd: /Users/gwwood/src/training-kit
git version 1.9.0
==> Installing gem dependencies…
==> Cloning into submodules
bundle exec sass _stylesheets/page.scss:_stylesheets/page.css

bundle exec sass _stylesheets/home.scss:_stylesheets/home.css
bundle exec sass _stylesheets/workbook.scss:_stylesheets/workbook.css
bundle exec jekyll build
Configuration file: /Users/gwwood/src/training-kit/_config.yml
            Source: /Users/gwwood/src/training-kit
       Destination: /Users/gwwood/src/training-kit/_site
      Generating... Error reading file /Users/gwwood/src/training-kit/slides/github-first-look.html: invalid byte sequence in US-ASCII
  Liquid Exception: invalid byte sequence in US-ASCII in _includes/footer.html, included in index.html
error: invalid byte sequence in US-ASCII. Use --trace to view backtrace
rake aborted!
Command failed with status (1): [bundle exec jekyll build...]
/Users/gwwood/src/training-kit/Rakefile:13:in `block in <top (required)>'
Tasks: TOP => test
(See full trace by running task with --trace)
```

And here is the detection code:
```
gwwood-mac{533} 2014-04-28T19-14-23-0700 ~/src/training-kit $ gwwood-mac{533} 2014-04-28T19-14-23-0700 ~/src/training-kit $ perl -ne 'print "$. $_" if m/[\x80-\xFF]/' /Users/gwwood/src/training-kit/slides/github-first-look.html
5 title: GitHub – A First Look
```