- Fix go-gogs-client#10
- Related to #809

Collaborators have write access as default, and can be changed via repository
collaboration settings page to change between read, write and admin.

Similar to GitHub:
https://github.com/blog/2111-issue-and-pull-request-templates

Priority:
- root
- .gogs
- .github

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.

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

Release download file name doesn't include tag number #2339
Download: Changed to use refName instead of commit.ID for downloaded file name

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