Add Ruby dependency information via Gemfiles.

Add Gemfile and Gemfile.lock, both of which are used by Bundler (a
Ruby gem) to encode Ruby dependencies for projects.

- Gemfile.lock is machine-generated (but human-readable) and encodes
  the most specific Ruby dependency information.
- Gemfile is human-written, and typically encodes less specific Ruby
  dependency information. It is used by Bundler if Gemfile.lock does
  not exist. Rubyists recommend committing both files.
Summarizing this week's lab meeting
CBC interview
Merge pull request #397 from gvwilson/blog-cbc-spark

Blog post about Greg Wilson being interviewed on CBC Radio
Merge pull request #325 from goxberry/add-gemfile

Add Ruby dependency information via Gemfiles.
Updating blog post
Removed a few unused rewrite rules (issue #5)

I checked the 2014 awstats logs (~swc/tmp/awstats/) for urls that matched the
various rewrite patterns and removed only those that had no hits.
Fixing mailing addresses on the discuss page
Merge pull request #399 from gvwilson/fixing-addresses-on-discuss-page

Fixing mailing addresses on the discuss page
Fixes Philipp Bayer's image.
Merge pull request #400 from drio/master

Fixes Philipp Bayer image name.
Blog post on SSI CW14
Update info on building _site after recent Makefile target changes
Updated blog post about lab meeting
Merge pull request #402 from apawlik/siteBuildInfo

Update info on building _site after recent Makefile target changes
Merge pull request #398 from pipitone/sysadmin_issue_5

Removed a few unused rewrite rules (sysadmin issue #5)
Fixed the date error and spaces
Merge pull request #401 from apawlik/postSSICW14

Blog post on SSI CW14
Merge pull request #396 from gvwilson/blog-lab-meeting

Summarizing this week's lab meeting