* Remove unused custom-alphabet feature of random string generator

Fix random string generator

Random string generator should return error if it fails to read random data via crypto/rand

* Fixes variable (un)initialization mixed assign
Update test GetRandomString

Signed-off-by: Michael de Wit <mjwwit@gmail.com>

* Correction LDAP username validation

As https://msdn.microsoft.com/en-us/library/aa366101(v=vs.85).aspx describe spaces should not be in start or at the end of username but they can be inside the username. So please check my solution for it.

* Check for zero length passwords in LDAP module.

According to https://tools.ietf.org/search/rfc4513#section-5.1.2 LDAP client should always check before bind whether a password is an empty value. There are at least one LDAP implementation which does not return error if you try to bind with DN set and empty password - AD.

* Clearing the login/email spaces at the [start/end]

Delete old temp local copy before we create a new temp local copy

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

Integrated optional bindata for the templates

* Fix #344 (regression in PR-API #248)

Suppress the error when we're removing a file that may not exist

* Added rel="noopener" to target="_blank" hrefs

* Replaced gogs.io/docs with docs.gitea.io

* golint fixed for modules/setting

* typo fixed and renamed UNIXSOCKET to UnixSocket

* Lint models/release.go

* Lint models/ issue_label, issue_mail & mail.go