Added minimum password length to app.ini (#223)

conf/app.ini

 COOKIE_REMEMBER_NAME = gitea_incredible
 ; Reverse proxy authentication header name of user name
 REVERSE_PROXY_AUTHENTICATION_USER = X-WEBAUTH-USER
+; Sets the minimum password length for new Users
+MIN_PASSWORD_LENGTH = 6
 
 [service]
 ACTIVE_CODE_LIVE_MINUTES = 180

modules/setting/setting.go

 	CookieUserName       string
 	CookieRememberName   string
 	ReverseProxyAuthUser string
+	MinPasswordLength    int
 
 	// Database settings
 	UseSQLite3    bool
 	CookieUserName = sec.Key("COOKIE_USERNAME").MustString("gitea_awesome")
 	CookieRememberName = sec.Key("COOKIE_REMEMBER_NAME").MustString("gitea_incredible")
 	ReverseProxyAuthUser = sec.Key("REVERSE_PROXY_AUTHENTICATION_USER").MustString("X-WEBAUTH-USER")
+	MinPasswordLength = sec.Key("MIN_PASSWORD_LENGTH").MustInt()
+
+	if MinPasswordLength == 0 {
+		MinPasswordLength = 6
+	}
 
 	sec = Cfg.Section("attachment")
 	AttachmentPath = sec.Key("PATH").MustString(path.Join(AppDataPath, "attachments"))

options/locale/locale_en-US.ini

 reset_password = Reset Your Password
 invalid_code = Sorry, your confirmation code has expired or not valid.
 reset_password_helper = Click here to reset your password
-password_too_short = Password length cannot be less then 6.
+password_too_short = Password length cannot be less then %d.
 non_local_account = Non-local accounts cannot change passwords through Gitea.
 
 [mail]

routers/user/auth.go

 		ctx.RenderWithErr(ctx.Tr("form.password_not_match"), tplSignUp, &form)
 		return
 	}
+	if len(form.Password) < setting.MinPasswordLength {
+		ctx.Data["Err_Password"] = true
+		ctx.RenderWithErr(ctx.Tr("auth.password_too_short", setting.MinPasswordLength), tplSignUp, &form)
+		return
+	}
 
 	u := &models.User{
 		Name:     form.UserName,
 	ctx.HTML(200, tplResetPassword)
 }
 
-// ResetPasswdPost response fro reset password request
+// ResetPasswdPost response from reset password request
 func ResetPasswdPost(ctx *context.Context) {
 	ctx.Data["Title"] = ctx.Tr("auth.reset_password")
 
 	if u := models.VerifyUserActiveCode(code); u != nil {
 		// Validate password length.
 		passwd := ctx.Query("password")
-		if len(passwd) < 6 {
+		if len(passwd) < setting.MinPasswordLength {
 			ctx.Data["IsResetForm"] = true
 			ctx.Data["Err_Password"] = true
-			ctx.RenderWithErr(ctx.Tr("auth.password_too_short"), tplResetPassword, nil)
+			ctx.RenderWithErr(ctx.Tr("auth.password_too_short", setting.MinPasswordLength), tplResetPassword, nil)
 			return
 		}