Add a deposit command to the payment module

It makes it easier to find out how to deposit, since the payment
had no commands, and thus was not included in the modules list
when !commands was used

tipbot/modules/payment.py

@@ -104,6 +104,9 @@ def UpdateCoin(param):
     log_error('UpdateCoin: Failed to get bulk payments: %s' % str(e))
   last_wallet_update_time = time.time()
 
+def Deposit(nick,chan,cmd):
+  Help(nick,chan)
+
 def Help(nick,chan):
   SendTo(nick, "You can send %s to your account:" % coinspecs.name);
   SendTo(nick, "  Address: %s" % GetTipbotAddress())
@@ -113,5 +116,12 @@ RegisterModule({
   'name': __name__,
   'help': Help,
 })
+RegisterCommand({
+  'module': __name__,
+  'name': 'deposit',
+  'function': Deposit,
+  'admin': True,
+  'help': "Show instructions about depositing %s" % coinspecs.name
+})
 RegisterIdleFunction(__name__,UpdateCoin)