Revert "Added the ability to associate trace information with failing specs"

Pushing this back to 4.0 in hopes of increasing the chance that third
party reporters will notice it and add support.

This reverts commit 7a289f1de7.

src/core/Env.js

@@ -1318,16 +1318,6 @@ getJasmineRequireObj().Env = function(j$) {
       currentSuite().setSuiteProperty(key, value);
     };
 
-    this.trace = function(msg) {
-      var maybeSpec = currentRunnable();
-
-      if (!maybeSpec || !maybeSpec.trace) {
-        throw new Error("'trace' was called when there was no current spec");
-      }
-
-      maybeSpec.trace(msg);
-    };
-
     this.expect = function(actual) {
       if (!currentRunnable()) {
         throw new Error(