Changes to repo-header-download-drop

- conf/locale: update Japanese locale

Fixes #921

Fix #922

Fixes #921 and makes the Mention regexp be in line with the others

Link to previous commited source file (diff.view_file button) instead of returning 404 for deleted files.

- routers/admin: add rewrite update hook operation
- conf/locale: update locale file due to ini behavior changes
- cmd/cert_stub.go: remove useless code
- cmd/fix.go: no longer need fix command(at least now)

Add option to provide configuration file on command line

Updated gogs.css - monospace font for hash

Updated gogs.css to use monospaced font for sha hash label in repository view to make it look nicer because of equal label width.

allow http push by token - #842

Make Signup button display configurable - #884

- models/issue.go: format comment type names

- modules/base/markdown.go: fix issue link issue
- routers/repo/view.go: remove useless code

- conf/locale: add mew translator profile

Fix user mention bug when parsing markdown documents

fix highlighting css for del code

new lines highlighting format

Referencing issues from commit messages is now possible.