Update docker management script. Bug-fix notification utf-8 encoding.
- Added new docker shell scripts to operate on all instances. Additional command line aliases to interact with specific instances via "docker exec".
- Bug-fix notification issues on utf-8 encoding.
- Update to MIME subtype for "jpeg" over "jpg".
- Update to unify "Content-Disposition" as "attachment" instead of mixed "inline" and "attachment"; supply filename and reference using in template via cid.
Edited by Lin, Kuo-wan