fixed path bug
unified layout and improved usage

* refactored and improved stylesheet
* added helper for footer
* adjusted basic layout
* adjusted pages (except register page)
* adjusted login, logout and denied page
fixed content-scroll width to avoid (native) horizontal scrollbar
replaced addition with sum due to invalid/non-standard CSS syntax
forced guest-user to be last in list add added separating hr before guest
improved only-login spec condition (footer) to avoid unitialized value warning
added footer-link for rules
applied common page layout to register page
added sum of all users to statistics
just a little position adjustment (removed top margin of input)
added top margin which was previously removed in style.css (input-element)
Merge branch 'layout' of github.com:blastmaster/BeerPlusPlus into layout

Conflicts:
	templates/statistics.html.ep
improved statistics: user is not shown if count equals zero
Merge branch 'layout' of github.com:blastmaster/BeerPlusPlus into layout
Merge branch 'layout' into develop

Conflicts:
	scripts/create_user.pl