[gh-577] Upgrade Drupal Core to 7.19

CHANGELOG.txt

includes/bootstrap.inc

misc/collapse.js

misc/drupal.js

misc/vertical-tabs.js

modules/aggregator/aggregator.info

modules/aggregator/tests/aggregator_test.info

modules/block/block.info

modules/block/tests/block_test.info

...block/tests/themes/block_test_theme/block_test_theme.info

modules/blog/blog.info

modules/book/book.info

modules/book/book.pages.inc

modules/book/book.test

modules/color/color.info

modules/comment/comment.info

modules/contact/contact.info

modules/contextual/contextual.info

modules/dashboard/dashboard.info

modules/dblog/dblog.info