Implement view()

For 1.1.0 we will need a new function/method view()

$result = couchbase_view(string, $handle, string $design_doc_name, string $view_name[, array $options]);
$result = Couchbase::view(string $design_doc_name, string $view_name[, array $options]);

Result should be an iterator that we can loop over like this:

while($row = $result->fetch_row) {

}

or

foreach($result AS $key, $value) {

}

Ideally, this fetches results as they are requested from PHP.

$options is an associative array that just passes on any k/v pairs that one can specify on a CouchDB view: http://wiki.apache.org/couchdb/HTTP_view_API#Querying_Options

For testing, see the test cases in https://github.com/couchbaselabs/php-couchbase/blob/master/test/CouchbaseTest.php
(test data in https://github.com/couchbaselabs/php-couchbase/blob/master/test/lib.php) we need that at least.

On the libcouchbase side, check examples/couchview.c how to query the view.