* optimization for user.GetRepositoryAccesses to reduce db query times

* fix missing cache

- Update import paths from github.com/go-gitea to code.gitea.io
- Fix import path for travis

See https://docs.travis-ci.com/user/languages/go#Go-Import-Path

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

- fix bug when add a repo to team, all other team members gets access as well

README: fix typo

This commit does a lot of the work of refactoring the access table in a table with id's instead of strings.

The result does compile, but has not been tested. It may eat your kittens.

This commit does a lot of the work of refactoring the access table in a table with id's instead of strings.

The result does compile, but has not been tested. It may eat your kittens.