Some enhancement for trac-post-commit-hook

[jiangxin]

Enhanced trac-post-commit-hook:

• Support tickets with the following syntax:

  command #1,3-5,7 and #9
  command ticket:1,3-5,7 and ticket:9
  

• Add —time option: Set datetime to when this hook runs, or commit time.
• Add —status option: Set fixed ticket status other than closed.

[jiangx]

(In [78]) Contribute trac-post-commit-hook enhancement. Fixed #21.