Fix closing issues and clientID specification

[chriswiggins]

As per issues #55 and #56.

I have not been able to create test cases yet but I can confirm this works with the client code we have developed internally

[mcollina]

Thanks! :).

Could you add one test for the "old client" thing, just connecting two clients and see the first one disconnected?

[mcollina]

May I ask who do you work for? :). I'll just add a link in the wiki or the README!

[chriswiggins]

Have now added the uni test for the old client and confirmed it works :-)

Rather you just put my name in the README as this was done in personal time anyway

[chriswiggins]

So it didn't work for a secure server. Will just have to wait and see if the changes I've made fix that (I have confirmed on my side though)

[chriswiggins]

OK so works on v0.10 but not v0.8. @mcollina, can you take a peek at what I'm checking and suggest changes I can make to ensure it works on v0.8?

[mcollina]

I'll merge and fix it. The main issue is the different implementation of TLS between 0.8 and 0.10, in particular it seems that 'destroyed' do not exist in 0.8.