Use WordPress post slugs as Tumblr's custom slugs, too.

git-svn-id: https://plugins.svn.wordpress.org/tumblr-crosspostr/trunk@870478 b8457f37-d9ea-0310-8a92-e5e31aec5664
Videos from Vimeo.com are now recognized and crossposted, too.

git-svn-id: https://plugins.svn.wordpress.org/tumblr-crosspostr/trunk@870479 b8457f37-d9ea-0310-8a92-e5e31aec5664
Recognize YouTube's "privacy enhanced" (`-nocookie`) mode videos.

git-svn-id: https://plugins.svn.wordpress.org/tumblr-crosspostr/trunk@870480 b8457f37-d9ea-0310-8a92-e5e31aec5664
Decode `&amp;` in crossposted tags so Tumblr displays them correctly.

git-svn-id: https://plugins.svn.wordpress.org/tumblr-crosspostr/trunk@870481 b8457f37-d9ea-0310-8a92-e5e31aec5664
Safer output escaping for `<textarea>` on options screen.

git-svn-id: https://plugins.svn.wordpress.org/tumblr-crosspostr/trunk@870482 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update readme, `.pot` file, version bump to 0.7.6.

git-svn-id: https://plugins.svn.wordpress.org/tumblr-crosspostr/trunk@870483 b8457f37-d9ea-0310-8a92-e5e31aec5664