prevent warnings

'Only variables should be passed by reference'
prevent warning

'xmlrpc_is_fault expects first parameter to be array'
Merge pull request #7 from steeffeen/patch-1

prevent warnings
Merge pull request #8 from steeffeen/patch-2

prevent warning
Fixed callvotes
Connection and Structures refresh
See http://forum.maniaplanet.com/viewtopic.php?f=463&p=214229#p214227 for more info
Adding back [set/get]ServerPackMask for old API
Missing check in setCallVoteRatios
Xmlrpc\Request fallback: adding null case (considered as a string) and empty checks
Connection: handling vote argument check as in other methods
Fixed setCallVoteRatiosEx arguments order (though it's deprecated anyway)
Merge remote-tracking branch 'upstream/master'