WIP - Factor out base.html
Introduce common model, including site static domain
Update README.rst

Info about rbenv (for Sass)
Add stylesheets/.ruby-version
Add Gemfile and Gemfile.lock

Includes sass
Work on README.rst and add rb-inotify for sass
Start working on sass stylesheets
Work on static domain specification
Add example static.wildlemur.org nginx config (used in dev)
Add site.js to base.html template
Start to work on the JavaScript build framework
Add initial manifest.json for JavaScript files
Finish being able to produce site JavaScript files

Includes:

 - Which static filenames are used in HTML is determined at runtime via global
   'environment' setting.  It understands 'development', 'production' and
   'troubleshooting'.