tweet 6.x-4.0

Notes

• Everyone should run update.php after upgrading to this release.
• The biggest change from 3.x to 4.x is that this module can now be used with services other than Twitter, such as Identi.ca. This required API changes, hence the new branch.

Changes since 6.x-3.1

#626862 Tweet in block
Fixed accidental dependency on core Taxonomy module
#694224 Allow other twitter-clones to create links, too by dereine and IceCreamYou
#744712 Let hooks decide where the image should be
Changed JavaScript window-open method so it doesn't refresh the page
Improved format of [node-tags] token to not include a leading space
Improved shortening tweet to within 140 characters
PHP4 compatibility