Notify admin if a user goes over 500 messages in 30 days

Notify only once per day (using expiring redis key).
Can notify MUC or user, always sends directed presence first so it will join MUC
if not joined.
Ignore all messages direct to the component, mostly to throw out live messages
from MUC if we join that to notify.

Allow using pay-by-mail or eTransfer during register

Just gives them the information and we're done. Support has to manually process
these payments anyway.

Tell user about bonus amount when doing credit card top up

Use PG connection pool

Hotfix, iq replies coming to customer_ should try the manager first

Alt top up command

To show mailing address, eTransfer address, Bitcoin addresses, and allow
generating a new Bitcoin address.

Handle invalid customer id

An invalid customer id is an error from braintree, so handle the error and
return an empty list of payment methods.

Refactor command list to use composition

Also rename buy credit to top up

Add btc_addresses to Customer

And use that in registration instead of implementing it inline

Command to get to the credit card settings page

Add plans and electrum structure to example

Reply to extdisco with sip server

fix config sample syntax

Spec says we must reply to all IQs

So say feature-not-implemented if we haven't got it with some other handler.

Merge identical cases

Validate that amount of credit to buy is in valid range

Rename buy-credit to buy credit

When no plan, all plan attributes are nil

Merge branch 'conditionally-show-commands'

* conditionally-show-commands:
  Only show buy credit option if customer has a plan and a credit card
  Show commands conditionally (plus add voicemail record command)

Only show buy credit option if customer has a plan and a credit card