#93 Fix mix/matched argument flags.

This relates to issue #93 where it was discovered we weren't quoting
the instance name or service name of the parameters passed to
us from the command line. This quotes those values that are passed to
the lib.

src/Topshelf/Hosts/AbstractInstallerHost.cs

@@ -106,13 +106,13 @@ Installer CreateInstaller()
 			string arguments = " ";
 
 			if (_description.InstanceName.IsNotEmpty())
-				arguments += " -instance:{0}".FormatWith(_description.InstanceName);
+				arguments += " -instance \"{0}\"".FormatWith(_description.InstanceName);
 
             if (_description.DisplayName.IsNotEmpty())
                 arguments += " -displayname \"{0}\"".FormatWith(_description.DisplayName);
 
             if (_description.Name.IsNotEmpty())
-                arguments += " -servicename:{0}".FormatWith(_description.Name);
+                arguments += " -servicename \"{0}\"".FormatWith(_description.Name);
 
 			var installer = new HostInstaller(_description, arguments, installers);