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.
added canonical url to header

--HG--
branch : 3.1.x
added Scott Vokes to list of contributors
allowed fetching compiled content of active item
added test case for including own compiled content
cleaned up finding duplicates
added improved dependency tracking to release notes
made nanoc invocation default to compile
added support for locals in filters and layouts
made tests not ignore SystemExit
merged changes from 3.2.x branch
fixed some warnings
added version information to crash log
update uglifyjs test for latest version
set 3.3 release date to today
added nanoc3 executable to gemspec
added tag for 3.3.0
added outdatedness warning to 3.2 documentation
updated links to latest documentation

--HG--
branch : 3.1.x
fixed link to updated documentation

--HG--
branch : 3.1.x