Work on squads, alerts on new user with empty or spy profile

Closes #1
Closes #2

lib/welcomer/welcomerinterface/welcomerinterface.go

@@ -0,0 +1,15 @@
+// i2_bot – Instinct PokememBro Bot
+// Copyright (c) 2017 Vladimir "fat0troll" Hodakov
+
+package welcomerinterface
+
+import (
+	// 3rd party
+	"github.com/go-telegram-bot-api/telegram-bot-api"
+)
+
+// WelcomerInterface implements Welcomer for importing via appcontex
+type WelcomerInterface interface {
+	Init()
+	WelcomeMessage(update tgbotapi.Update) string
+}