Update modernizr.js to v2.7.1.
_includes/sidebar.html: fix indentation.
_includes/header.html: include the page class in body only if it exists.
Merge pull request #140 from XhmikosR/modernizr

Update modernizr.js to v2.7.1.
Merge pull request #141 from XhmikosR/includes

Includes
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Merge pull request #144 from randomecho/nolicence-description-typo

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