- modules/middleware/context.go: add HandleAPI method

The boolean flags in the repo context have been replaced with mode and two methods

Also, the permissions have been brought more in line with https://help.github.com/articles/permission-levels-for-an-organization-repository/ , Admin Team members are able to change settings of their repositories.

cmd/web.go: check version after load config

- 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)

- routers: use new binding convention to simplify code
- templates: able to set HTTP port number in install page

All basics are implemented. Missing are the right (localized) strings
and the page markup could have a look at by a frontend guy.

- POST /user/repos
- POST /org/:org/repos