Fix node_modules exclude

Author: billti

src/compiler/commandLineParser.ts

@@ -532,7 +532,7 @@ namespace ts {
                 }
                 else {
                     // by default exclude node_modules, and any specificied output directory
-                    exclude = ["./node_modules"]
+                    exclude = ["node_modules"]
                     let outDir = json["compilerOptions"] && json["compilerOptions"]["outDir"];
                     if(outDir) {
                         exclude.push(outDir);