* Lint models/release.go

* Lint models/ issue_label, issue_mail & mail.go

This was done semi-programmatically, not really documenting anything

Semi-automatic linting (don't really document things)

* Handle user ssh key input better

ssh_key: when user submitted keys had a newline at the end, strings.Split
would have created a slice with an empty last element, and the key type
check would be incorrect. Perhaps a better way is to look for 'ssh-rsa' or
'ssh-dsa' at the beginning of the string, but this is simple.

* ssh_key: correct indentation

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

See #70

- Added public entries to reserved keywords list
- Rename variables
- Derped comment

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

* Write LDAP, SMTP, PAM, DLDAP back to all uppercase

* Fix type in unused constant name

* Other MixCased fixes

* Complete MixerCasing of template constants

* Re uppercase LTS and LDAPS suffixes

* Uppercase JSON suffix in constant names

* Proper case LoginNoType

* Prefix unexported template path constants with "tpl"

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

Still use GOGS_WORK_DIR and GOGS_CUSTOM env variables
as a fallback if the equivalent GITEA_* are not set,
warning user about the need for change.

Does not change "gogs" to "gitea" in webhook type name
Because "gogs" hook type is part of the API (routes) and used
in templates...

Closes #87