PCBC-692: Use MutationResult instead of StoreResult
PCBC-692: Use MutationResult instead of StoreResult

Closes: #24
Change-Id: Iaaa7ca7f5ffe563184e52dc81d6f2cfc2b96f4c4
Reviewed-on: http://review.couchbase.org/c/php-couchbase/+/129533
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

couchbase/php-couchbase,couchbaselabs/php-couchbase,couchbaselabs/php-couchbase,couchbase/php-couchbase,couchbase/php-couchbase,couchbase/php-couchbase,couchbaselabs/php-couchbase,couchbaselabs/php-couchbase