Fix access for team mode update

Rewrite of access migration

The old migration had a few issues:
 - It left old column names around
 - It did not give the right access levels for owners and admins

Also, this includes a migration that fixes the authorization of owner teams, which was previously ORG_ADMIN (instead of ORG_OWNER)

Access refactor

Some comments and improvements for migrations

Conflicts:
	cmd/serve.go
	models/access.go
	models/migrations/migrations.go
	models/org.go
	models/repo.go
	models/user.go
	modules/middleware/org.go
	modules/middleware/repo.go
	routers/api/v1/repo.go
	routers/org/teams.go
	routers/repo/http.go
	routers/user/home.go

This commit does a lot of the work of refactoring the access table in a table with id's instead of strings.

The result does compile, but has not been tested. It may eat your kittens.

Collaboration

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