Fix the sigil for merge request emails

Ex. redirect from
  localhost/group/project.git
to
  localhost/group/project

It used to prevent 404 error when follow submodule http link
like http://localhost/group/project.git

This reverts commit 20c47923.

Feature api download archive

Create a wiki when wiki_enabled:true

Change-Id: Id2cae87c8cd383bc6cbcbdecf0f77c161bb82eab

Change-Id: I2b0752bc2593a944d42dde0ffe0ef9ce408228a5

Conflicts:
	doc/api/repositories.md

Change-Id: I7ebc39b47ff860813d9622ba6776583536e6e384

defaults to HEAD

Conflicts:
	spec/requests/api/repositories_spec.rb

Change-Id: Id114aca6c59d75f18e49bf9f33809a04e010bfb6