* Move code.gitea.io/gitea/routers/api/v1/convert to code.gitea.io/gitea/modules/convert

* fix fmt

Signed-off-by: Tamal Saha <tamal@appscode.com>

when you use gitea as OAuth2 provider, the /api/v1/user should return
user primary email as identifier, which is unique in OAuth2 clients.

this patch use convert.ToUser replace all u.APIFormat in api requests,
return primary email when caller is yourself or admin.

* move sdk structs to moduels/structs

* fix tests

* fix fmt

* fix swagger

* fix vendor

Fix all the resting errors to have a valid swagger file.

They are still some warnings but nothing blocking.

Doing so I found that some request still misses son parameters for some POST/PUT/PATCH request. This means the a client generated from the swagger file will not work completely. 

Fix #4088 by activating validation in drone
Should fix #4010.

* Update swagger documentation

Add docs for missing endpoints
Add documentation for request parameters
Make parameter naming consistent
Fix response documentation

* Restore delete comments

* Add swagger comment for adminCreateOrg

* Add swagger comment for admin route

* add hook swagger doc

* Add tags

* Add auth

* Fix name of responses

* Edit name method

* Update vendor

* make generate-swagger

- Generate swagger.json into public/
- Add swagger-ui auto-installation
- Add footer link to local swagger-ui
- Add /swagger url for using app url.
- Fix Swagger-UI version via git tag

From code.gitea.io/go-sdk/gitea
  To code.gitea.io/sdk/gitea

- 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

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

- User profile un/follow
- List user's followers/following