prepare 4.2.1 (#947)

Author: OsirisTerje

build.cake

@@ -13,7 +13,7 @@ var configuration = Argument("configuration", "Release");
 //////////////////////////////////////////////////////////////////////
 
 var version = "4.2.1";
-var modifier = "-dev.2";
+var modifier = "";
 
 var dbgSuffix = configuration.ToLower() == "debug" ? "-dbg" : "";
 var packageVersion = version + modifier + dbgSuffix;