(refs #437)Show author instead of committer

* Explicit classify committer and author
* Use author to render avatar image html
* Support commit view
(refs #437)Show author at repo file list view
(refs #437)Show author and committer at files view
(refs #437)Fix typo

Threre is more good function name, but i have no idea :dizzy_face:
(refs #437)Show author at blob, commits and wiki history view
Fix TestCase
Merge branch 'show-author'
Add tar.gz achive download function.