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.
Add new selectors to relativize_paths filters covering all HTML cases.

The missing selectors were 'input/@src', 'frame/@src', 'iframe/@src', 'base/@href' and 'area/@href'.
Add object/@data, param[@name='movie']/@content and change all old selectors to the two generic */@src and */@href
removed albino from Gemfile.lock
made nanoc handle nanoc/cri-less gemfiles
updated Gemfile
Merge pull request #123 from arnau/release-3.4.x

added new selectors to relativize_paths filter covering all HTML cases
made "identical" not show up without --verbose
fixed typo
added staleness checker
merged changes from 3.4.x branch
cached tty-ness of stream for speed
memoized plugin resolution
create-site.rb: Omit optional `@type` attribute, and remove `@media`

The `type=text/css` attribute/value pair for `<link rel=stylesheet>` is
optional as per HTML5. http://mathiasbynens.be/notes/html5-levels#level-1

Removing the `media=screen` attribute/value pair allows specifying the
styles for various types of media in a single CSS file.
Fixed capturing for slim filter (fixes #127)
stopped output_filenames from outputting folder names

The output_filenames method of the Checker class was including folder
paths in its output. This was causing the internal_links and external_links
checkers to choke.
support for protocol-relative urls in external link checker

Protocol-relative urls are of the form //example.com. They get converted
to the form http://example.com before being run through the external
link checker. Of course, this assumes the protocol is http, but that is a
fairly small and safe assumption, with minimal repercussions if wrong.
Merge pull request #129 from Spooner/release-3.4.x

merge fix for capturing in slim filter
cleaned up modifications to capturing fixes for slim filter
Merge pull request #125 from mathiasbynens/tweak-html

Minor tweak to create-site.rb’s HTML output: omit optional `@type` attribute, and remove `@media`