- Patch #137211 by merlinofchaos: move theme information to .info files and improved theme inheritance.

#127539: progressive operation support, refactoring update.php code to a generic batch API to support runnning operations in multiple HTTP requests
  - update.php is already on the batch API
  - node access rebuilding is in the works
  - automatic locale importing is in the works

 Thanks to Yves Chedemois (yched) for the good code quality, very wide awareness of issues related to batches,
 and the fantastic turnaround times. Hats off.

- Refactor partial-page handling for the maintenance page. It's an exotic quirk for update.php and belongs there.

#100516: CSS preprocessor to cache and compress all .css files. Benchmarks show up to 40% faster page loads.

- Patch #77919 by chx, eaton, moshe, et al: enable programmaticaly submitted forms via the pull model.

- Keep all JS widget css together

- Patch #68926 by chx, jeremy, steven, eaton, webchick, amazon, neil, nedjo et al: an initial install system for Drupal core.