Deprecated throw

There are several places where "throw" is used. "Throw" is now deprecated in Solidity in favour of "revert()", "require()" and "assert()". So please replace 
  if (!condition) {throw;} 
to
  require(condition);
because "require" automatically throws if the condition is not met.


@pauliax
ETH address: 0xaAbf60384137D460427fD5B849017e59479797A1