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>

* Fix search by issue type

* Fix invalid reference in feeds template

* Comment for GetActAvatar

* Add integration test

* fix bug on issue view when not login

* hide issue watch when not login

* update the tests

* fix test on issue

* bug fixed for API to get user's repos

* add tests and fix another place

* test user2 since user1 has no repos

* 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