Fix a few test command issues

Author: ethanhann

src/InEngine.Core/Commands/Echo.cs

@@ -9,11 +9,11 @@ namespace InEngine.Core.Commands
     public class Echo : AbstractCommand
     {
         [Option("text", HelpText = "The text to echo.")]
-        public string Text { get; set; }
+        public string VerbatimText { get; set; }
 
         public override void Run()
         {
-            Write.Line(Text);
+            Write.Line(VerbatimText);
         }
     }
 }

src/InEngine.Core/Commands/Options.cs

@@ -5,13 +5,13 @@ namespace InEngine.Core.Commands
 {
     public class Options : IOptions
     {
-        [VerbOption("null", HelpText = "Always fail. Useful for end-to-end testing.")]
+        [VerbOption("fail", HelpText = "Always fail. Useful for end-to-end testing.")]
         public AlwaysFail AlwaysFail { get; set; }
 
         [VerbOption("echo", HelpText= "Echo some text to the console. Useful for end-to-end testing.")]
         public Echo Echo { get; set; }
 
-        [VerbOption("null", HelpText = "A null operation command. Literally does nothing.")]
+        [VerbOption("succeed", HelpText = "A null operation command. Literally does nothing.")]
         public AlwaysSucceed Null { get; set; }
 
         public string GetUsage(string verb)