Sanitizer with white/black list of elements/attributes

Signed-off-by: Fajran Iman Rusadi <fajran@gmail.com>
Merge branch 'sanitizer-white-black-list' of git://github.com/fajran/goread into fajran-sanitizer-white-black-list
Allow styles
Trim incoming whitespace
Allow some more tags
Missed
Allow some non standard attrs