Add test that filters contacts
Import contact2vcard library from Gaia
Add at least the familyName, otherwise the library that converts mozContacts to vCards fails
Add UID field to the generated vCard
Don't read the whole stream in memory when a UTF_8_Reader is opened, but on the first call to UTF_8_Reader::read
Add other fields to the supported fields list; support listOpen and listClose natives; support natives to get contacts as vcards
Test contact list filtering
Set initialized to true when the UTF_8_Reader is initialized