Beginnings of test-suite added.

Beginnings of test-suite added.

* Beginnings of test-suite added.

* Made SoupContext opaque. Removed SoupContextPrivate. Added soup_context_get_uri() to get the uri string for a given context.

* Added a response_headers hashtable to SoupRequest so the callback can do whatever it wants with passed headers. All entries in this hashtable are just parsed strings from req->priv->recv_buf, so no new strings are allocated.

* Renamed custom_headers to request_headers

* Fixed context creation logic

* Made soup_servers hashtable use case insensitive hostname matching.

* Removed SOUP_ERROR_URI_NOT_FOUND, SOUP_ERROR_URI_NOT_PERMITTED, and SOUP_ERROR_URI_OBJECT_MOVED from SoupCallbackResult enum. Its up to the application to figure out all the different HTTP states. This may change however.

* Added querystring to SoupUri, so that contexts can be cached based only on path.

* Added default port logic to SoupUri. Known protocols are https (port 443), http (80), smtp/mailto (25), and ftp (20).