by always using SignInLink and SignUpLink in the form action

Without this patch a 401 is returned for unspecified endpoints, making
the LFS client ask for HTTP credentials. This behaviour was introduced
with the new locking API:

https://github.com/git-lfs/git-lfs/blob/master/docs/api/locking.md

* Add change-password admin command

* Improve user openid list CSS and regenerate CSS

* allow push to init a wiki repo

* compact error check

* Add notice that LFS mirroring is not supported

* Drop German translation

* Send notifications to partecipants in issue comments

Closes #1216

Includes test (still failing)

* Do not include "labelers" to participants

Fix test to expect what GetParticipants return

* Implement GPG API

* Better handle error

* Apply review recommendation + simplify database operations

* Remove useless comments

Fix nil-dereference bug

* Take navbar out of column
* Add styles to navbar
* Changed navbar classes
* Remove unneeded !important from index.css
* Remove unneeded !important from _explore.less

* Added script to download licenses from github

* Synced licenses with github repo

* Renamed scripts directory into contrib

* Added script to download gitignores from github

* Synced gitignores with github repo

Also renames `forgot_password` translation key to
`forgot_password_title` and `forget_password` to
`forgot_password`

Includes entry in CHANGELOG about the breaking change
(and some markdown fixes in there)

See See https://www.gnu.org/software/librejs/

Closes #1200

* Add integration test for signup

* Remove unused functions

* Refactoring

* Add repo_create_test.go

* Rollback the incomplete repo create test

* Comply with linter requirements and simplify the code a little bit