Partial conversion to Jeckyll server-side layout.

Additional files in Jekyll update

Additional Jekyll tests

The documentation about how layouts work is a bit vague. This is to make
sure I'm understanding correctly.

Completed the conversion to Jekyll

Eliminated browser-side includes in favor of Jekyll includes and
layouts.

Additional pieces missed in last commit

Removed old-style pages.

Fixed syntax error in specifications.html

Use posts for news on home page

Test

Fixed news category.

Converted to Jekyll with news in the form of posts.