Adding invite to IRCClient

[taos]

I think there should be a invite method to IRCClient.

[exarkun]

(In [30577]) Branching to 'ircclient-invite-4820'

[exarkun]

(In [30578]) Apply invite.patch

refs #4820

[exarkun]

Thanks for working on this patch. The implementation looks straightforward and correct to me. Concerning the tests though:

1. I like ClientInviteTests, except for
   1. the lack of docstrings
   2. the testFoo naming (instead of the preferred test_foo style).
2. Oops, also, the setUp call in testInvite isn't necessary. I think ClientTests.test_invite is probably redundant with the tests on ClientInviteTests though.
3. methods should be separated from each other by two blank lines; classes by three.
4. New APIs (like IRCClient.invite) should be marked up with @since tags

These are simple points, so I'll go ahead and correct them and then merge the change. Thanks again!

[exarkun]

(In [30580]) vertical whitespace fixes

refs #4820

[exarkun]

(In [30581]) @since marker

refs #4820

[exarkun]

(In [30582]) Add docstrings to everything on ClientInviteTests; fix vertical whitespace and test method naming; remove spurious setUp call; insert missing whitespace between function arguments.

refs #4820

[exarkun]

(In [30583]) Remove the redundant test_invite

refs #4820

[exarkun]

(In [30584]) restore deleted blank line

refs #4820

[exarkun]

(In [30585]) Merge ircclient-invite-4820

Author: taos, exarkun Reviewer: exarkun Fixes: #4820

Add IRCClient.invite method to send INVITE messages.