Update lib/layouts.js

Errors sometimes carry additional attributes on them as part of the passed error data.
A utility that utilizes it, for example - is called 'errs', which is in use for instance 'nano' - the couch-db driver.

when only the stack is printed - all the additional information that is augmented on the error object does not sink to the log and is lost.

consider the following code:

```
//the oups throwing utility
function oups(){
  e = new Error();
  extend(
    { message    : "Oups error"
    , description: "huston, we got a problem"
    , status     : "MESS"
    , errorCode  : 991
    , arr :[1,2,3,4,{}]
    , data: 
      { c:{}
      , d:{e:{}}
      }
    }
  throw e;
}

var log = require('log4js')

try{
  oups()
} catch( e ) {
   log.error("error on oups", e );
}

```


output before the fix

```
error on oups Error: Oups error
    at repl:1:11
    at REPLServer.eval (repl.js:80:21)
    at Interface.<anonymous> (repl.js:182:12)
    at Interface.emit (events.js:67:17)
    at Interface._onLine (readline.js:162:10)
    at Interface._line (readline.js:426:8)
    at Interface._ttyWrite (readline.js:603:14)
    at ReadStream.<anonymous> (readline.js:82:12)
    at ReadStream.emit (events.js:88:20)
```


output after the fix would be

```
error on oups { [Error: My error message]
  name: 'Error',
  description: 'huston, we got a problem',
  status: 'MESS',
  errorCode: 991,
  arr: [ 1, 2, 3, 4, {} ],
  data: { c: {}, d: { e: {} } } }
Error: Oups error
    at repl:1:11
    at REPLServer.eval (repl.js:80:21)
    at Interface.<anonymous> (repl.js:182:12)
    at Interface.emit (events.js:67:17)
    at Interface._onLine (readline.js:162:10)
    at Interface._line (readline.js:426:8)
    at Interface._ttyWrite (readline.js:603:14)
    at ReadStream.<anonymous> (readline.js:82:12)
    at ReadStream.emit (events.js:88:20)
```

lib/layouts.js

@@ -49,10 +49,9 @@ function formatLogData(logData) {
         if (output) {
             output += ' ';
         }
-        if (item && item.stack) {
-            output += item.stack;
-        } else {
         output += util.inspect(item);
+        if (item && item.stack) {
+            output += "\n" + item.stack;
         }
     });