Add exec (#10)

* Add exec

* Fix linux tests

* unnecessary dependency

* Dont prefix ExecOptions with I

* Consistency nits

* Respond to feedback

* Add toolrunner explanatory quote

* Format

packages/exec/__tests__/scripts/print-args-exe.cs

@@ -0,0 +1,14 @@
+using System;
+namespace PrintArgs
+{
+    public static class Program
+    {
+        public static void Main(string[] args)
+        {
+            for (int i = 0 ; i < args.Length ; i++)
+            {
+                Console.WriteLine("args[{0}]: '{1}'", i, args[i]);
+            }
+        }
+    }
+}