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Fix SPDX license indicator for GPLv3

Ruby 2.1.6 is latest in 2.1 line.

Ruby 2.2.2 is latest in 2.2 line.

Relates to #598

Accommodate Sass syntax tree change.

Related to #595

For now we'll need to live with old-style RSpec syntax.

Refactored the guide filename and path detection a bit -
now also keeping a separate :dir field to reference the directory.
Using "url" field for that purpose seems awkward, so replaced
all these usages with :dir.

Fixes #584

Fixes #577

Specify sass version.

Because sass 3.3.x breaks some of the css related specs of jsduck.

Although the build on ruby 1.8.7 is still failing, this change fixes the builds on ruby 1.9.3 and 2.0.0 on Travis-ci.

Refs #536

A patch by Patrick Gleichmann.

Specs by me.

Refs #527

Fixes #515

Instead of relying on offset values, align the top-right of the menu
with bottom-right of the Docs app title.

Fixes #516

For IE8+ and other browsers the ExtJS 4 framework supplies a data-uri,
but for IE 6 and 7 it defaults to an URL pointing to sencha.com,
which will cause problems when offline.

Refs #511

Only do it for the generated TOC, but leave the original HTML alone.

Fixes #507

Implement a special '@browser' keyword, which when used as:

    --external=@browser

will include all the standard browser web API classes, listing
of which taken from:

https://developer.mozilla.org/en-US/docs/Web/API

Fixes #502

Instead of :external_classes, use :external - like the name of
the option itself, and like it is now with all other options.

Quite a hack... something better is surely needed.