Add hook_luceneapi_query_rebuild() to API

Because of how Zend query objects are constructed, some items cannot be altered via hook_luceneapi_query_alter(). Therefore, we need a hook that will allow developers to intercept the query object and return a new one before hook_luceneapi_query_alter() is invoked so we can have complete control over the object that will be passed to luceneapi_find(). This hook will be useful for doing things like converting term queries to wildcard queries so we can have partial word matches by default.