Error logged everytime an assignee was removed

* add delete branch track on pull request comments

* don't change vendor

Also add unit tests

* track assignee for issue

* fix lint

* use getUserByID instead Get

* track labels changed on issue view & resolved #542

* add missing head comment & sort & fix refresh

Moved attachments into seperate go file

* Use relative URLs

* Notifications - Mark as read/unread

* Feature of pinning a notification

* On view issue, do not mark as read a pinned notification

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

* Notification - Step 1

* Add copyright headers

* Cache issue and repository on notification model

Correctly handle simultaneous assignee/poster filters, and conflicting assignee filters

a transaction session was in progress. MailParticipants was failing
silently because of the SQLITE_LOCKED error. Make sure failures in
MailParticipants enter the log, and pass on the transaction context.

issue: let caller pass in database context, and use it
issue_comment: obtain database context to pass to UpdateIssueMentions
issue_comment: log any error from call to MailParticipants
issue_mail: pass on database context to UpdateIssueMentions

Also address other TODOs

Also move duplicated code into repo.APIFormat(..)

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

See https://github.com/golang/go/wiki/CodeReviewComments#mixed-caps

* Fix PR-webhook issue where Label-data is stale

* Conventions \o/

* logs are nice if they're consistent...