Bump v5.3.0.

Bump v5.2.3.

Bump version 5.2.2.

Bump version 5.2.1.

Bump version v5.2.0.

Bump version v5.1.0.

Improve gulpfile for ctan.

Update according to CAN's rule.

- Reorganize files for CTAN upload.
- Update Readme for CTAN.
- Update checksum and changelog for v4.8.1.

Bump v4.8.

Fix dist making script to fit new versioning control system.