lib: turn on strict mode

Turn on strict mode for the files in the lib/ directory.  It helps
catch bugs and can have a positive effect on performance.

PR-URL: https://github.com/node-forward/node/pull/64
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Fedor Indutny <fedor@indutny.com>

lib/console.js

@@ -19,6 +19,8 @@
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 // USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+'use strict';
+
 var util = require('util');
 
 function Console(stdout, stderr) {
@@ -89,13 +91,13 @@ Console.prototype.timeEnd = function(label) {
 };
 
 
-Console.prototype.trace = function() {
+Console.prototype.trace = function trace() {
   // TODO probably can to do this better with V8's debug object once that is
   // exposed.
   var err = new Error;
   err.name = 'Trace';
   err.message = util.format.apply(this, arguments);
-  Error.captureStackTrace(err, arguments.callee);
+  Error.captureStackTrace(err, trace);
   this.error(err.stack);
 };