uses protocol relative url

See: http://www.paulirish.com/2010/the-protocol-relative-url/
Added an .POT file, generated by makepot.php:

php makepot.php wp-plugin ~/wp/git/pronamic-cookies ~/wp/git/pronamic-cookies/languages/pronamic-cookies.pot
Fixed indent.
Added an missing esc_attr().
use _e() instead of echo __().
Updating to 0.2.7.
Merge branch 'release/0.2.7'