Moved HelpBot into core

src/main/scala/io/scalac/slack/bots/system/HelpBot.scala

@@ -0,0 +1,20 @@
+package io.scalac.slack.bots.system
+
+import io.scalac.slack.MessageEventBus
+import io.scalac.slack.bots.AbstractBot
+import io.scalac.slack.common.{Command, HelpRequest, OutboundMessage}
+
+/**
+ * Maintainer: Patryk
+ */
+class HelpBot(override val bus: MessageEventBus) extends AbstractBot {
+  override def act: Receive = {
+    case Command("help", options, raw) =>
+      publish(HelpRequest(options.headOption, raw.channel))
+  }
+
+  override def help(channel: String): OutboundMessage = OutboundMessage(channel,
+    s"*$name* is for helping. Duh \\n" +
+      s"`help` - display help from all bots \\n " +
+      s"`help {botName}` - display help for certain bot module")
+}