Fixes typos

Lint models/org.go

Golint fixed for modules/log

Lint models/repo_mirror.go

Lint models/repo_branch.go

Lint models/ssh_key.go

Lint models/access.go

Lint models/user_email.go

modules/process: add ExecDirEnv (next to ExecDir)

Add a sibling to ExecDir which is capable of specifying environment variables,
so that we can invoke `git` with GIT_INDEX_FILE, GIT_DIR, etc..

For #258

Update locales and add Swedish

Fix HTTP headers for issue attachment download

* golint fixed for modules/setting

* typo fixed and renamed UNIXSOCKET to UnixSocket

Signed-off-by: Andrey Nering <andrey.nering@gmail.com>

- Download filename was wrong for files other than images. Example: It was `download` instead of `file.pdf`
- PDF was downloading instead of showing on browser

Dropped latest publishing from drone

Lint models/admin.go

Lint models/update.go, release.go & webhook_slack.go

Fix typos

Fixed s3 publishing within drone

Additions to the Drone CI integration

Golint fixed for modules/context

Golint fixed for modules/avatar

Golint fixed for modules/cron

Golint fixed for modules/httplib

Golint fixed for modules/template

Golint fixed for modules/markdown

Golint fixed for modules/mailer

* Lint models/release.go

* Lint models/ issue_label, issue_mail & mail.go