Update contributing guidlines link

previously displays 404

#2505 Allow to fork and disallow to create PRs for mirrors.

Fix issue email formatting. Addresses #2331

Fix chmod for several files in conf/locale/ and public/

Remove the possibility of using email as user name when user actually push
through combination of email and password with HTTP.

Also refactor update action function to replcae tons of arguments with
single PushUpdateOptions struct.
And define the user who pushes code as pusher, therefore variable names shouldn't
be confusing any more.

Add GitHub's issue and pull request templates.

fix dependency broken because xorm's API changed

Was using the wrong method and now uses the method which checks if
the avatar link is relative or not.

Convert mirrors to regular repositories

Admins and user itself sees private org relations on profile

Only show activities and repositories on the dashboard, that the user has access to

Remote repository path is renamed but does not delete
outdated local copy which still has old repository path
as remote.

Change main content area bg to white, keep area above tabs grey

Module httplib will be replaced a well done third-party package
soon, so remove its unused tests

Add default branch to repo payload

update .gopmfile to reflect git-module update

Updated to reflect version increment in commit 47adc0e.

Add install option for log path