Switch vectors and maps over to curly braces from square braces to line up with C++11.

unittests/exception_guards.chai

@@ -1,4 +1,4 @@
-auto results = [];
+auto results = {};
 
 for (auto i = 2; i < 6; ++i) {
   try {
@@ -31,4 +31,4 @@ catch {
   results.push_back("defaultcatch");
 }
 
-assert_equal(["c2: 2", "c2: 3", "c3: 4", "c3: 5", "defaultcatch"], results);
+assert_equal({"c2: 2", "c2: 3", "c3: 4", "c3: 5", "defaultcatch"}, results);