Added web service operation getFilteredObjects with params:
- objectTypeId - the filtering by object type. if it is null, all types will be returned
- aliasFilter - a substring of aliases. if it is null, all aliases will be returned
- firstResult - the number of the first result.
- maxResults - the maximum number of results returned (page size). if it is <= 0, all results from firstResult will be returned.
#56 (without db background yet)