[dev] httpclient -> AjaxClient

[Chuck Hagenbuch]

Quoting Jan Schneider <jan at horde.org>:

> I would like this renaming to be reverted, because we won't be able to
> use the client in applications other than Horde without breaking BC in
> the future, for example to replace the name expansion in IMP.

Ah, fair point. I'll do it.

-chuck

-- 
"But she goes not abroad in search of monsters to destroy." - John 
Quincy Adams