Fixed embeds sanitizing to allow new syntax for src, fixed two errors in test
made the sanitizer check cleaner, made test more robust

Signed-off-by: Naomi Novik <shalott@gmail.com>
allowed youtube-nocookie for embeds

Signed-off-by: Naomi Novik <shalott@gmail.com>
Fixed embeds sanitizing to allow new syntax for src, fixed two errors in test
made the sanitizer check cleaner, made test more robust

Signed-off-by: Naomi Novik <shalott@gmail.com>
allowed youtube-nocookie for embeds

Signed-off-by: Naomi Novik <shalott@gmail.com>
Cleaned mismatches in html cleaner spec

Signed-off-by: Naomi Novik <shalott@gmail.com>

Conflicts:
	spec/lib/html_cleaner_spec.rb
Merge pull request #1506 from shalott/youtube_sanitizer

Video embed sanitizer