all if throw's converted to requires

oraclizeAPI_0.4.sol

@@ -763,7 +763,7 @@ contract usingOraclize {
     }
 
     function oraclize_newRandomDSQuery(uint _delay, uint _nbytes, uint _customGasLimit) internal returns (bytes32){
-        if ((_nbytes == 0)||(_nbytes > 32)) throw;
+        require((_nbytes != 0) && (_nbytes <= 32));
         bytes memory nbytes = new bytes(1);
         nbytes[0] = byte(_nbytes);
         bytes memory unonce = new bytes(32);
@@ -853,10 +853,10 @@ contract usingOraclize {
 
     modifier oraclize_randomDS_proofVerify(bytes32 _queryId, string _result, bytes _proof) {
         // Step 1: the prefix has to match 'LP\x01' (Ledger Proof version 1)
-        if ((_proof[0] != "L")||(_proof[1] != "P")||(_proof[2] != 1)) throw;
+        require((_proof[0] == "L") && (_proof[1] == "P") && (_proof[2] == 1));
 
         bool proofVerified = oraclize_randomDS_proofVerify__main(_proof, _queryId, bytes(_result), oraclize_getNetworkName());
-        if (proofVerified == false) throw;
+        require(proofVerified);
 
         _;
     }
@@ -935,10 +935,8 @@ contract usingOraclize {
     function copyBytes(bytes from, uint fromOffset, uint length, bytes to, uint toOffset) internal returns (bytes) {
         uint minLength = length + toOffset;
 
-        if (to.length < minLength) {
-            // Buffer too small
-            throw; // Should be a better way?
-        }
+        // Buffer too small
+        require(to.length >= minLength); // Should be a better way?
 
         // NOTE: the offset 32 is added to skip the `size` field of both bytes variables
         uint i = 32 + fromOffset;