Added virtual buckets support by implementation of memcached_bucket_set bindings.
Threating return of memcached_bucket_set.
Merge branch 'master' of git://github.com/php-memcached-dev/php-memcached

Conflicts:
	php_memcached.c
Merge branch 'master' of github.com:bpospichil/php-memcached
Added Memcached::setBucket
Merge pull request #101 from mkoppanen/feature-vbucket

Feature vbucket