Create empty HTML files for all pages

These have routing specified via app.yaml, with adjustments to Grunt for
building.
Basic mustaching structure setup

This does not yet include the error and redirect templates, nor is
children data supported yet, but the gist of it is in-place here.
Add child navigation support

This is done by maintaining a pointer to the parent node when recursing
down the sitemap.
Restore error and redirect HTML pages

Mustaches these files and adds the transformation logic to Grunt.
Additional tweaking

Move all rel attributes to the links themselves that make up the
navigation, and add very basic ugly styling so orientation is possible
now.
Grunt --live-reload mode

Adds a new flag usable in build/run and watch modes to enable the
live-reload server.
Fix missing Yandex.Translate menu

Adds this to the Grunt SITEMAP structure.
Support for app.yaml Grunt build

The application configuration can now be built out via the Gruntfile.
Move sitemap out to JSON file

This will just hopefully make maintenance easier.
Rearrange Gruntfile to be by-task

Instead of trying to do the declarative stuff up-front, this rearranges
the file to have each task and its dependencies all together.
Watch improvements

For dealing with template files, we now only re-generate the one that
changed instead of all of them.
Remove livereload

This doesn't work reliably enough given the current build setup.
Adjust clean task

Changes this to clean the build/ directory contents rather than the
build directory itself -- this keeps the GAE SDK server happy by not
forcing it to lose its reference to the directory if it's already
running.
Mustache variable clean-up

These now use a more consistent naming across different Mustache types.
Adjust 'partials' watch task

Because partials also affect the error and redirect markup, the tasks
should reflect that.
Fix rebuild on sitemap change

This did not have reload: true wrapped properly, so sitemap changes did
not affect the build.
Minor Gruntfile clean-up

Removes options that are already defaults and clarifies some comments.
Shorten up Mustache function

This condenses some objects and also moves the grandchild logic so it's
not so cumbersome.
Sitemap support for website

Adds support for a sitemap tree to be generated via the Mustache
templates.
Extend home helper to have two modes

One of these can be used for terse navigation links, and the other for
the masthead.