Add 'static' data source to Nanoc core.

The original author of this data source appears to be @ddfreyne. Data source code from here:

    http://pastie.textmate.org/914015

Update `create_site` command to include a stub configuration, routing rule and compilation rule for the static data source.
Fix mocha require deprecation warning
Fix handlebars filter to work with latest version
Update Gemfile.lock
Merge branch 'release-3.4.x'
Fix watch test case
Update Sass filter to match Sass 3.2.3 code
Add missing super call in xml sitemap test case
Make watcher test case kill watcher thread to avoid garbage output
Merge branch 'release-3.4.x'
Backport watch test case from master (because this one sucks)
Make XML sitemap test case more reliable
Increase watcher timeout in test case from 5s to 10s
Readd fssm/listen deprecation warning notice
Make item rep accessible as both @rep and @item_rep everywhere
Add fssm to Gemfile
Merge changes from release-3.4.x branch
Remove fssm from Gemfile and add handlebars and pandoc-ruby
Fix pandoc test case
Make file checksums use mtime and size instead of content