Add Proxy Setting about csipsimple HOT 3 CLOSED

The Expert setting is done to allow this kind of configuration.
If it doesn't allow you to save it's probably since there is a mistake in one 
field.
A common mistake is done with the account id.
You must be sure that you didn't forget the < and > characters. Account id 
should
look like this : "<sip:[email protected]>" or "Display Name 
<sip:[email protected]>"

I want basic settings to be really simple (in order 90% users find it easy to
configure). What I can do, is to make a wizard for your provider. Let me know 
if you
think it could be valuable for the app and if so, say me what are the 
configuration
fields that should be pre-filled.

Another point is that I have to find a way to notify the user if a field is not 
well
filled (but for now since i rely on android standard fields, there is no easy 
way to
do this kind of notification). 

Let me know if with a well formatted account id you are able to register. (I've 
yet
tested the proxy setting since I've no registrar to test this, so i'm really
interested with your feedback)

I just noticed that even with expert settings I disabled the proxy settings 
(since it
was buggy).

I'll try to reactivate it and deliver it in the next version.
(My last comment about the configuration of expert account is still valid)

Should be ok in 0.00-12