Test: check compiler output for selectors with keywords in them.

Refs #1929.

Tests/Objective-J/Preprocessor/OutputTests/Messages/keyword-in-selector.j

@@ -0,0 +1 @@
+[object for:a in:b nil:nil];

Tests/Objective-J/Preprocessor/OutputTests/Messages/keyword-in-selector.js

@@ -0,0 +1 @@
+objj_msgSend(object,"for:in:nil:",a,b,nil);

Tests/Objective-J/Preprocessor/OutputTests/OutputTest.j

@@ -11,6 +11,7 @@ var FILENAMES = [
         "Messages/one-parameter",
         "Messages/multiple-parameters",
         "Messages/ternary-operator-argument",
+        "Messages/keyword-in-selector",
 
         "Misc/preprocess-if-directives",
         "Misc/regex-simple-char-classes",