Set request headers in helper functions, and new helper for requests with string-formatted URLs

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

* Do not allow commiting to protected branch from online editor

* Add editor integration tests for adding new file and not allowing to add new file to protected branch

* MySQL, Postgres integration tests in drone

* Fix .drone.yml

* sign drone

* resign drone

* improve integration test to resue models/fixtures and store git repos with source

* use gitea-integration-meta dir instead .tar.gz and cleanup every before every test

* fix import package name

* Integration test framework

* udpate drone sign

* Formatting fixes and move router.go to routers/

* update sign for drone