Notable changes since last release:

• Implemented spec compliant <address>, <header>, <footer> (#39)
• Implemented spec compliant <form> and <blockquote> (#46)
• Added spec compliant datetime attribute to <time>, <ins>, <del> (#35)
• Defined <article>, <aside>, <nav>, <section> as Sectioning content
• Defined <hgroup> as Heading content
• Empty <figure>s are no longer removed
• Made allowfullscreen attribute of <iframe> guarded by %HTML.IframeAllowFullscreen setting (#38)
• Dropped obsolete elements: <basefont>, <center>, <dir>, <font>, <menu>, <strike>
• Dropped obsolete <iframe> attributes: scrolling, frameborder, longdesc, marginheight, marginwidth

Changes to internal APIs:

• Removed deprecated class HTMLPurifier_AttrDef_Regexp
• Removed deprecated class HTMLPurifier_AttrTransform_Progress
• Removed deprecated HTMLPurifier_ChildDef_ classes: Details, Figure, Media, Picture
• Removed helper class HTMLPurifier_ChildDef_HTML5
• Removed deprecated method HTMLPurifier_HTML5Definition::setup()