Upgrade to scan/kss-php v0.3.0

Changes dependency from kss-php v0.2.0 to v0.3.0. Modifies example
code to use getSectionChildren and loop over the result instead of
calling each section manually.
Upgrades to scan/kss-php v0.4.0

Upgrades to scan/kss-php which adds get, trim, and belongsToReference
to the Section object.
Updates Example with dynamic menus and pages

KSS Bundle example dynamically creates a menu by getting
all the top level sections. Styleguide.html.twig page removed
and replaced with a more dynamic reference.html.twig page that
can be used to render all sections in the styleguide through
the single action.
Removes reference to removed styleguide page.

Index page included a link to the styleguide page which was removed
in the last commit. Removes the link.
Corrects reference to menu and css files

Incorrect menu reference was used. Corrects it to the correct
example menu.

Corrects the path the KSS Parser uses to find the stylesheets.
Updates section-heading to fit look of styleguide

Changes the styles of the section-heading to class to more
closely match the other styles present in the styleguide.
Corrects example twig code displayed on reference

The example twig code on the reference page referenced an
outdated variable. Updates it to the current variable name.
Changes style of header on reference.html.twig

Changes the style of the header on reference.html.twig to match
the header on the index.html.twig page for a more consistent look.