base: deletion of redundant/obsolete meta and rev.

* Removes meta content-type.
  http://code.google.com/p/doctype-mirror/wiki/MetaCharsetAttribute

* Removes obsolete meta element to specify document-wide language.

* Replaces deprecated link rev in favour of link rel.
  http://www.whatwg.org/specs/web-apps/current-work/multipage/obsolete.html#attr-link-rev
base: correction of malformed <link> tags.

* Closes link tag like the orphan tags they are.
base: simplification of redundant role=navigation

* Removes redundant role on nav.
  "In the majority of cases setting an ARIA role and/or aria-* attribute
  that matches the default implicit ARIA semantics is unnecessary and not
  recommended as these properties are already set by the browser".
  See: http://www.w3.org/TR/html5/dom.html#aria-usage-note
  and http://www.w3.org/TR/html5/sections.html#the-nav-element
search: missing space between attributes of input